The more weight you put on, the harder your heart has to work just to keep you alive.
Everyone has what is called a TDEE, or Total Daily Energy Expenditure. In short, how many calories does your body burn in a day? For a normal, healthy, adult male, this is around 2000.
As you put on weight, this number actually goes up, and it becomes an upward vicious cycle. Your body burns more, so you eat even more yet, and so on.
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