Question

Nutrition and Weight Loss

Why does a high-fat diet cause more weight gain than a high-protein diet?

A Answers (44)

  • AMichael Roizen, MD, Internal Medicine, answered
    When it comes to converting calories, your body processes fat most efficiently—meaning that you actually keep more of it, because your body doesn't need to expend as many calories trying to store it. On the flip side, your body works hard to process protein—making it highly flammable to your body's metabolic furnace.
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  • AReza Yavari, MD, Endocrinology/diabetes/metabolism, answered

    It is simple: fat has 9 calories per gram and protein has 4 calories per gram. So 100 grams of fat delivers 900 calories as opposed to 400 (less than half). But more importantly, fat can be easily stored in the body while protein cannot be stored. Our body does not have a protein storage depot like fat cells are for ingested fat. So, our body has to break down protein into amino acids - the building blocks of proteins - and rebuild proteins when our body needs them.

    This process of breakdown and rebuilding of proteins costs energy. That is why 100 calories from fat add up to 95 calories stored in the body, while hundred calories from protein end up as 70 calories (fat is 95% efficient and protein only 70%.) So, next time you choose to eat a protein-rich food such as a steak, pay attention to how much fat you are consuming with it, because a high-protein diet could also be a high-fat diet.

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  • ALivia Ly, Nutrition & Dietetics, answered

    Fat foods have a higher energy density than protein foods. Fat is less satiating than protein when compared Joule for Joule, and high fat foods are more likely to induce overconsumption than low fat foods. On the other hand, high dietary fat content is not the only factor responsible for weight gain. A sedentary lifestyle with a low level of energy expended on physical activities is another causative factor, which interacts with dietary fat content. Also, high protein diets are associated with reductions in total body fat and waist circumference.

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  • ANatalie Hesler, Nutrition & Dietetics, answered
    Fat contains more calories than protein, 9 calories for 1 gram of fat, whereas protein only contains 4 calories per fat gram. More fat causes you to feel sluggish and tired, therefore being less active and burning fewer calories. 
  • ARoberta Anding, Nutrition & Dietetics, answered on behalf of Academy of Nutrition and Dietetics
    Fat is more calorically dense, palatable and the efficiency of digestion is high. But it basically comes down to a balance question and this balance depends on calories. We consume about 300 calories more per day and most of these calories come from added sugars and fat. So as we search for the "best weight reduction strategy" keep in mind it comes down to reduce your intake and increase your exercise output.
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  • ADee Sandquist, Nutrition & Dietetics, answered on behalf of Academy of Nutrition and Dietetics

    Fat has more calories per unit than protein. It's easy to add additional calories by using fat and many people eat too much fat. Consider reducing the amount of salad dressing, fried foods, and cream-based soups or toppings and you'll find it easier to lose a few pounds.

  • AAmy Jamieson-Petonic, Nutrition & Dietetics, answered on behalf of Academy of Nutrition and Dietetics

    A high fat diet provides more than double the calories of a high protein diet. For example, fat provides 9 kilocalories per gram, whereas protein provides 4 kilocalories per gram. So you are getting twice the calories from a high fat diet and more calories leads to more rapid weight gain. A dietitian at eatright.org can help you find the right program for you...good luck!

  • APamela Charney, Nutrition & Dietetics, answered
    Diets higher in fat tend to have more calories than diets that are high in protein because fat has more calories per unit of weight than protein. So if you have 5 grams of fat in your diet (a teaspoon of butter has 5 grams of fat), you are getting 45 calories, while 5 grams of protein would provide only 20 calories.
  • ALisa Stollman, Nutrition & Dietetics, answered

    Fat contains 9 calories per gram. Protein contains 4 calories per gram. Unless the calories are controlled for both diets, the high-fat diet will ultimately contain more calories. Thus, it can add on the pounds quicker.

  • AStacy Haumeaa, Nutrition & Dietetics, answered

    Fat comes packaged with higher calories per gram than protein.  For example, a 4 oz portion of cooked rib eye steak has approximately 400 calories, versus a 4oz portion of cooked skinless chicken breast has approximately 400 calories.  The weight equation is calories in (food and beverages consumed) = calories out (daily activity and exercise) for weight maintenance.  If an individual consumes more calories than they use daily, over time this would lead to weight gain.

  • AJennifer Shaw, Nutrition & Dietetics, answered
    The biggest reason is probably a simple matter of taking in more calories on a high fat diet since fat contains 9 calories per gram and protein contains 4 calories per gram. So a small portion of something high in fat will have more calories. Some studies also show that protein takes a bit more work to break down, which can up your metabolism after eating a high protein meal, and it also tends to keep you satisfied longer, which means you might end up eating less overall, again a matter of taking in fewer calories.
  • ANeal Spruce, Fitness, answered on behalf of dotFIT
    In very simple terms, a high-fat diet cannot satisfy your appetite as well as a high-protein diet when the calories are equal in both. This would lead you to eat more calories on a high-fat diet in order to feel full. One gram of fat holds ~ 9 calories compared to 1gm of protein yielding only ~4 and because of this and respective water content, the volume of food in equal caloric diets is far greater in the high-protein diet, also adding to fullness. Additionally, it takes very little energy (calories) to metabolize fat compared to protein. Dietary fat can be stored very easily as body fat when energy needs are met with other foods. But protein must go through a much longer process to be used or stored as energy, meaning you use over twice the calories when you metabolize dietary protein. For these and other reasons, protein has been proven in studies to be the most satiating of the three macronutrients (protein, carbohydrates and fats), meaning protein makes you feel full sooner. Also high-protein diets are simple because they limit most other foods and people get tired of eating protein all day, leading to an automatic reduction in calories. Not all high-protein diets are healthy, but as long as you keep the total protein less than 35% of your daily calories and include lots of fruits and vegetables (and whole grains where possible), short-term use can be a safe and effective weight loss solution.
  • AEnas Shakkour, Nutrition & Dietetics, answered

    Fat has 9 calories per gram. Protein has 4 calories per gram. Because fat is so calorically dense, a high-fat diet usually results in the consumption of too many calories. When one consumes more calories than their body burns, weight gain results. One should try to consume about 30% of calories from fat, and about 20% of calories from protein. Remember to choose your fats wisely as well.

  • ASheri Emma, Nutrition & Dietetics, answered

    There are three main food categories:  fat, protein, and carbohydrates. Fat contains 9 calories per gram, whereas protein and carbohydrates generally contain about 4 calories per gram. Therefore, fat has almost double the calories per unit. 

    It seems then that avoiding fat would be all that is required to lose weight. However, there is a reason why the "fat-free" diet fad of the 90's was not very successful. The concept seems easy, that if you don't eat fat you won't get fat. The reason it's not that simple is: it isn't fat alone that causes fat; it's carbohydrates in excess as well. Carbohydrates are the most efficient source of energy for the human body. It's meant to be used for energy as much as possible at the time of consumption, and any excess carbohydrates consumed are then stored for later. How are they stored?  They are largely stored as fat.

    So let's turn to protein. The first purpose of protein is for the amino acid building blocks of the protein. Our bodies need protein every day for growth and repair. The second purpose of consumed protein is to provide fuel, or energy, from its calories. However, protein as an energy source is not so efficient. The body has to work twice as hard to use protein for energy. The conversion of protein into glucose for energy requires two passes through the energy cycle. This causes our bodies to burn extra calories, simply from digestion. 

    Thus when we eat protein, we use it for our muscles, and growth and repair. We also use it for energy but burn extra calories in doing so. Fat, however, is just a calorie dense food strictly used for energy and any excess gets quickly stored, as fat.

    In conclusion, when wanting to lose weight and/or avoid weight gain, a person's diet should consist of lean protein, fruit, and vegetables, with minimal fats and minimal starch-like carbohydrates. This allows for your body to efficiently process all consumed items for necessary functions and leaves nothing left to store as fat.

  • AJudy Caplan, Nutrition & Dietetics, answered on behalf of Academy of Nutrition and Dietetics

    A high fat diet can be misleading. Some high fat diets which contain healthy fats, plus lean protein, fruits, veggies, and whole grains, can actually allow you to lose weight. It depends on the kind of fat and total calories.

     

     

     

     

  • AJessica Corwin, Nutrition & Dietetics, answered

    Fat grams provide us with 9 calories per gram, an amount more than double that found in carbohydrates and protein at 4 calories per gram. Therefore we are able to consume far more calories in a bowl of high fat food than if it were a bowl filled with lean proteins or whole grains. 

    Research published in the Journal of Obesity found evidence that a diet rich in lean protein is better at promoting satiety than a diet high in fat. This means that the protein helps us to recognize that we are full more quickly; therefore we have to eat less.

    The other big factor to consider is that high fat foods do not contain fiber, a food component that helps us feel full. Fiber is found in whole grains, fruits, vegetables, and protein rich nuts, seeds, and beans (not in animal products). Further studies have found that fiber will not only help to maintain our weight but it may reduce our risk of metabolic syndrome, heart disease, and certain cancers. 

    With this type of evidence, I would be quick to ditch the fried foods and sweet treats and seek out more beans, nuts, and seeds for a true boost in health. Blackbean quesadilla, anyone? ;)

    References

    Higher Protein Intake Preserves Lean Mass and Satiety with Weight Loss in Pre-obese and Obese Women. Obesity (2007) 15, 421–429; doi:10.1038/oby.2007.531

     

  • AJulieanna Hever, RD, Nutrition & Dietetics, answered
    Fat has more than twice the amount of calories per gram as does protein. Additionally, foods that are high in fat usually (but not always) tend to come loaded with sugars and other processed foods that contribute to weight gain. However, a high-protein diet is not ideal for weight loss either because it is harmful to your health in the long run. We only require about 10% of our calories to come from protein. Any more-especially from animal sources-increases your risks of excess weight, obesity, and most chronic diseases. Ideally for weight management and optimal health, consume the majority of your calories from whole plant sources of carbohydrates in conjunction with a small amount of protein and fat. Eating a whole food, plant-based diet makes it easy because you don't ever need to calculate or quantify any numbers. Just eat whole plant foods when you are hungry, stop before you are full, and you will effortlessly maintain your ideal body weight.
  • ABrian Tanzer, Nutrition & Dietetics, answered

    The two main reasons for this is fat contains 9 calories per gram and protein 4 calories per gram. The second reason is protein has a higher thermic effect of food (TEF). TEF is the amount of calories the body uses to digest, absorb, and metabolize food. The combination of a higher calorie content and lower TEF helps explain why a high-fat diet typically causes more weight gain than a high-protein diet.                       

                     
  • AJanis Jibrin, MS, RD, Nutrition & Dietetics, answered

    The main reason a high protein diet helps people lose weight is because people wind up eating fewer calories than they did before they started the diet.  Most high protein diets require that you drastically limit carbohydrates, and if you eliminate bread, pasta, cookies, cake and the like, it's no surprise that you'll lower calorie levels and lose weight.  Protein is also satiating, meaning it helps you feel full and quells appetite, always a plus for weight loss.

    On the other hand, you're not cutting out any food groups on a high fat diet, so you don't get the automatiic calorie drop.  And because fat has more than double the calories per gram as protein (or carbohydrates) it's easy to rack up calories on a high fat diet.

    That said, I don't recommend either type of diet.  My gripe against high protein diets (like Atkins) is that you not only restrict unhealthy carbs like cookies, but you cut out whole grains, certain fruit and other healthy carbs.  Instead, I recommend that you limit these foods, but not cut them out.  If you're trying to lose weight, have about 5 servings of whole grains or starchy vegetables, like potatoes.  A serving is 80 calories, and is about a half cup of cooked pasta, sweet potatoes, or 1/3 cup rice or legumes.  As for cereal, check labels to see the cup measure of 80 calories.

    As for the amount of fat in your diet, 30 to 35 percent works well for most people--that's moderate, not high.  Most of your fats should be "good" fats--rich in mono- and poly-unsaturated oils, foods like olive oil, canola oil, flaxseeds and other seeds, nuts and avocados.  Also make sure to eat fatty fish like salmon and sardines 3 times a week for omega-3s (a type of poly).  If you're trying to lose weight, aim for about 5 to 6 fat servings daily; a serving is 45 calories, such a teaspoon of oil or a tablespoon of nuts.

    Meanwhile, have about 6 to 8 protein servings daily--a serving is about 50 to 65 calories such as an ounce of seafood, poultry or meat (limit red meat to no more than once weekly); one egg; 2 - 4 ounces tofu. 

    Round out your diet with 2 servings (90 - 100 calories) of nonfat milk or calcium-fortified soymilk, nonfat or lowfat yogurt, and have plenty of vegetables and at least 2 fruits daily.

  • ALinda Kaminski, Nutrition & Dietetics, answered

    Ultimately, it depends on your total daily calorie intake. Gram for gram, fat has over twice as many calories as protein (9 calories for fat vs. 4 calories for protein). The more calories you take in, the greater your risk of weight gain. Therefore, if you consume a high fat diet, you are likely consuming a higher calorie diet as well. High protein diets are known to suppress appetite, which will likely allow you to consume less calories overall, thereby increasing your chances of losing or maintaining your current weight. However, high protein diets can be stressful on the body and hard to maintain long term, making it more likely to gain weight back once normal eating habits are resumed. A balanced, calorie controlled diet is best and easiest to maintain long term, containing moderate amounts of all major nutrients, including carbohydrates, fats, and protein.

  • AHeather Rudalavage, Nutrition & Dietetics, answered

    High fat foods tend to be "calorically dense" foods. That means you get a lot of calories in a smaller amount of food. It's easy to over eat when you are eating a lot of food that has a high fat content. Foods that are high in lean protein (high protein, low fat) are less calorically dense and also tend to be low in carbohydrates. Most Americans get enough protein in their diet, so protein supplements are usually a waste of money but also contain unnecessary calories. Eating a balanced diet with lots of whole grains, fruits, vegetables and lean meats is a good way to stay healthy.

  • ASuzy Weems, Nutrition & Dietetics, answered

    The high fat diet is generally one that is extremely tasty and fun to eat. The efficiency with which the body stores the extra Calories from fat is far better than that for protein. A few extra Calories from fat is easily converted to storage while a few extra Calories from protein is more difficult to convert for storage. Don't forget there are over twice the number of Calories in fat (gram for gram) as there are in protein.

  • AAlan Gaby, Nutrition & Dietetics, answered

    A high-fat diet does not necessarily cause more weight gain than any other type of diet. Although fat contains, gram for gram, more calories than does protein or carbohydrate, it is the total amount of calories consumed per day, not the source of the calories that determines weight gain. Nuts, which are high in fat, are particularly satiating, and consuming nuts regularly does not lead to an increase in caloric intake or to weight gain. Moreover, eating nuts may help prevent heart disease. The prevention and treatment of obesity is discussed in chapter 333 of my textbook, Nutritional Medicine (www.doctorgaby.com).

  • ASasson Moulavi, Nutrition & Dietetics, answered

    Fat has 9 calorie per gram, protein has 4 calorie per gram. So fat has more than  double the calories. Furthermore proteins suppress hunger while fat does not suppress hunger as well. You will get fuller eating 300 calories of protein then 300 calories of fat. This will make you need to eat more to get the same level of fullness. Fats also affect your body hormonal mechanism (insulin and more) in ways that cause you to store more fat then protein. 

  • AShraddha Chaubey, Nutrition & Dietetics, answered

    Because, high fat diet provides twice as much calories as protein. 1 gram of protein consumption will provide you only 4 calories while 1 gram of fat will provide you 9 calories. High fat diet may not only lead to gain weight but also may contribute to lipid abnormalities in your blood that may lead to heart disease and other complications as well. It is recommended that on an average your fat calories should not exceed 30% of your total allowed calories for the day. For your personal daily need you need to contact a registered dietitian in your area.

  • AElizabeth Casparro, MPH,RD, Nutrition & Dietetics, answered

    A high-fat diet causes more weight gain than a high-protein diet because per gram, fat has 9 calories whereas protein only has 4 calories. So, there are more than twice as many calories in fat as protein. However, be wary because many high protein foods can contain a lot of fat such as whole milk and USDA Prime beef. So, look for more "low fat" or "lean" protein foods such as beans, eggs, white meat chicken and USDA Select beef.

  • AJessica Ess, Nutrition & Dietetics, answered

    At the fundamental level, fat contains more calories per gram than protein (fat=9 cal/g, protein=4 cal/g), and generally speaking, consuming more calories than are burned causes an energy surplus in the form of weight gain. However, it's important to look at the diet overall. A high-protein, low-fat diet that is also high in carbohydrates might cause more weight gain than a high-fat, low-protein diet that is low in carbohydrates.

  • AJessica Crandall, Nutrition & Dietetics, answered on behalf of Academy of Nutrition and Dietetics

    Fat equals 9 calories/gram, where as protein equals 4 calories/gram. This can lead to over consumption of calories based on portion sizes.

  • ALinda Lockett-Brown, Nutrition & Dietetics, answered

    Fat has 9 calories per gram. Protein only has 4. Therefore, a 3 ounce serving of fat provides 900 calories. Three ounces of protein contains only 400 calories. No one eats pure fat but high fat foods have more calories and often those are hidden. Doughnuts and rib eye steaks have the fat hidden. Better choices are whole grain English muffins and lean cuts of beef like sirloin. The fiber in whole grains help you feel full longer. Ultimately, with any weight reduction program, your goal is to burn more calories than you eat.

  • AJuliet Zuercher, Nutrition & Dietetics, answered

    Typically, but not always, weight gain occurs when there is an imbalance of input versus output of energy (calories). Since fat offers more energy per gram than protein or carbohydrate, an excess of fat intake may result in an excess of energy for the body. If this energy isn't needed for functions in the body or expended by activity, weight gain may result. Yet, eating more protein isn't the answer for weight loss. Too much of any substrate (fat, carbohydrates or protein) is unhealthy for the body. Eating with balance, variety and moderation is the best way to achieve optimal health and a stable weight. 

  • AAnnemarie Colbin, PhD, Nutrition & Dietetics, answered

    I'm not sure this is true.  It is assumed to be true based on the thermodynamic model of calories, but the body does not work like a machine. Most people maintain their weight regardless of minor fluctuations. Fat, or lipids, as a category, is one of the three necessary nutrients. Notice that now the experts are beginning to distinguish between "good fats" and "bad fats," so clearly "fat" is not the problem. Context is. For example, a meal consisting of some polenta with a teaspoon of butter, carrots, zucchini, mesclun salad with olive oil and lemon, sautéed fish, and some pitted dates for dessert is less likely to create weight gain than a meal consisting of white pasta, fried chicken, white bread and butter, salad with fat-free dressing, and cheesecake with a diet soda. Fat with white flour and sugar are major culprits in our current obesity epidemic. Next is the outrageous abundance of high-fructose corn syrup in numerous processed foods and drinks.

    So leave poor fat alone and enjoy your well-balanced meals with some butter and olive oil!  Remember that fat contributes to satiety, and as fat-free cookies are lacking in it you are more likely to eat the whole box!  Good for the manufacturers, not good for the consumer.

  • AJanice Baker, Nutrition & Dietetics, answered

    It's all about total calories consumed. Fat is twice as high in calories as protein or carbohydrate per gram (weight) so a little goes a long way. Eating more calories than we need from any source will contribute to weight gain. On the other hand, small portions of healthful fats can keep our appetite satisfied so consider including sources such as nuts, seeds, avocado and olive oil in your diet for balance and variety.

  • ALaura Motosko, MSEd, RD, Nutrition & Dietetics, answered

    Calorie for calorie a gram of fat is 9 calories and a gram of protein is 4 calories. A high fat diet therefore may provide more calories that when consumed in excess and not used for energy may cause weight gain. Consuming a balanced diet with some healthy fats such as those found in nuts and olive oil, along with carbohydrate and protein in a variety of nutrient dense foods along with physical activity is important to prevent weight gain.

  • AHiral Modi, Nutrition & Dietetics, answered

    Fat is denser in calorie than protein. 1 gram of Fat = 9 kcalories while 1 gram of Protein = 4 kcalories. So when you eat high fat diet you are consuming more calories as compare to equal amount of high protein diet. Thus it leads to weight gain. In addition body stores fat and burns fat only when it needs energy for example during exercise. On the contrary high protein diet helps to build muscle and muscular body requires more energy.

    For each extra pound of muscle body burns 50 additional calories just for maintenance. Moreover, body burns more calories (almost twice) to digest protein as compare to fat. Also, protein helps to increase satiety (feeling of fullness after you eat) more than the fat, so after high protein meal you feel full for longer time and less likely to consume unnecessary calories.

  • ANadine Pazder, Nutrition & Dietetics, answered
    Because there is a difference in the amount of energy (calories) provided in protein, carbohydrate and fat. Both protein and carbohydrate provide 4 calories per gram. Fat provides 9 calories per gram. And because fat provides a lot of calories in a small serving, it is much easier to gain weight by adding fat to your diet.
  • ACindy Guirino, Nutrition & Dietetics, answered

    High fat foods usually come in a package with high sugar foods - think Cupcake!

    These foods can really pack on the pounds plus they create an addictive like pattern in the brain which has you craving more fat and sugar bombs of calories which can eventually lead to weight gain. Eat more whole foods and eat foods that have natural fat in them like nuts to avoid weight gain.

  • ARebecca Scritchfield, Nutrition & Dietetics, answered
    A high fat diet would cause more weight gain if the total energy intake over time exceeded your energy expended (the old calories in vs. calories out). Protein and fat are both nutrients that provide "sustained" energy. However, fat has 9 calories per gram (energy dense) and protein only has 4 calories per gram. You want to strike a balance with carbs, protein, and fat. Your eating pattern can resemble a "higher" percentage of fat than protein. For example, if you put together a plate with a fist size of whole grain, 2 fists of veggies, a palm size amount of protein and one source of fat (avocado, olive oil for example). This may provide about 50% of calories from carbs, 20% from protein and 30% from fat.
  • AKatherine Sanchez, Nutrition & Dietetics, answered
    Eating a high-fat diet may or may not cause weight gain than a high-protein diet. Weight gain happens when the food you eat has more calories than your body is burning. If you're eating too much food, you're going to gain weight, regardless. High-fat diets have gotten a bad rap, but the truth is that we NEED to eat good fats (think: avocados, nuts, seeds, salmon, tuna). Our cell membranes are made from fats, our brains need good fats, and without fat in our diet, we can't absorb vitamins A, D, E or K. Studies published in the International Journal of Obesity (2003) and the Journal of the American College of Nutrition (2011) have shown that people who eat certain foods that are high in fat (pistachios and almonds, for example) are actually more likely to maintain a healthy weight than those who don't. So does that mean you should eat lots of fatty foods? No, but don't shun them, either. Moderation is the key word for weight loss, along with reducing calories (from all sources), exercising regularly, and getting at least 6-8 hours of sleep every night. 
  • AMeagan Mohammadione, Nutrition & Dietetics, answered

    I agree with everyone else when they say that eating more fat leads to eating more calories. 

    Another reason that a high-fat vs. high-protein diet leads to weight gain is that protein is more "filling" than fat. Protein is harder for our bodies to breakdown, so it stays in our stomach longer, keeping us feeling full.

    Bonus: Eating protein causes a little jump in our metabolism while our bodies work to digest it!

    This doesn't mean that we should avoid fat completely! A moderate amount of fat in our diet is necessary for absorption of Vitamins A, D, E, and K. People who eat very little fat are actually at risk for developing deficiencies of these important vitamins!

     

  • AMolly Morgan, Nutrition & Dietetics, answered
    The bottom-line of weight is calories in versus calories out. High fat foods likely are providing more total calories (1 gram of fat has 9 calories) than high protein foods (1 gram of protein has 4 calories). Additionally, the key to maintaining weight loss is the ability to adhere to the plan, with whatever works best for your taste preference and lifestyle!
  • ARebecca S. Reeves, Nutrition & Dietetics, answered
    Three published studies (2 one year studies and 1 two year study) have now demonstrated that any reduced calorie diet can produce clinically meaningful weight loss regardless of which nutrient is emphasized. What is most important is finding the calorie-reduced diet that fits your lifestyle and a diet that you feel comfortable in following for the long term. Most diet failures occur because a person cannot incorporate the new eating patterns into his/her lifestyle so that the weight loss is maintained.
  • ASarah Mathot, Nutrition & Dietetics, answered on behalf of Academy of Nutrition and Dietetics

    Weight gain is a result of consuming more calories than what is expended over a period of time. If a diet is "high" or more than what an individual needs from protein or fat than weight gain will be the result. Fat provides our bodies with more calories per gram than protein therefore it would be easier to consume excess calories from fat.

  • ALouise Goldberg, Nutrition & Dietetics, answered

    Gram for gram, fat is more than double the calories as protein. If you consume a high fat diet, you are more likely to consume a higher amount of calories. Those excess calories get stored as fat and increase your weight. It is best to consume a diet that includes lean proteins and a small amount of HEALTHY fats, such as lean meats, fish, poultry, beans, soy products and nuts.

  • AAlberta Scruggs, Nutrition & Dietetics, answered

    The reason a high-fat diet causes more weight gain than a high protein diet is two-fold. A gram of fat has more kcalories, (more energy-dense), and uses a lessor amount of kcalories to convert and store dietary fat as fat in the body than protein does.

    1. One gram of fat provides nine (9) kcalories. One gram of protein provides 4 kcalories. If you eat 70 grams of fat, you eat 630 kcalories. If you eat 70 grams of protein, you eat 280 kcalories (more than twice the amount).
    2. It requires more energy to convert protein to usuable substances for the body (amino acids, glucose), to eliminate unusable substances (ammonia), or to be converted and stored as fat in a fat cell; whereas, it takes a small amount of energy (about 3% of total fat kcalorie amount), to store dietary fat in fat cells (because it's already fat).
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