Don't be fat.
The vast majority of diets and health issues are tied to obesity. Obesity will increase your risk of high blood pressure, poor cholesterol, diabetes, heart disease, various forms of cancer, stroke etc.. these are all major killers of people aged 40-70.
I'm not telling you to starve yourself either. In my early 30s, I know many friends who've just accepted the fact they are old now, and it's okay to be 50lbs overweight.
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