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The difference between obese people and thin people isn't the number of fat cells; it's the size of them. You don't make more fat cells the fatter you get; you have the same number of fat cells you had as an adolescent. The only difference is that the fat globules within each cell increase as you store more fat. By the way, muscles work the same way; you don't make more muscle cells; the muscle cells get larger.

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YOU: On A Diet Revised Edition: The Owner's Manual for Waist Management
For the first time in our history, scientists are uncovering astounding medical evidence about dieting -- and why so many of us struggle with our weight and the size of our waists. Now researchers...
As adults, obese people do not have more fat cells than thin people, but their fat cells are larger. The same is true in reverse: When an obese or overweight person loses weight, the fat cells shrink. But the number of fat cells doesn't change, just their size. Large fat cells have been linked to some of the chronic health conditions related to obesity, such as diabetes.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.