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Everything you eat, drink, or otherwise expose your body to, will affect your overall physical health and therefore, your erection. Diets that are high in fat, sugar, and artificial ingredients cause an increase in your body's inflammation response. Over time, this is damaging to blood vessels, especially those of your heart and your penis. Other culprits are nicotine (whether in cigarettes or in nicotine patches/gum) and excess in alcohol. Keep in mind that alcohol use of more than 1/2 - 1 drink per day has been shown to increase your triglycerides and LDL (bad) cholesterol which eventually contributes to arterial plaques and hardening of the arteries, resulting in decreased blood flow.