How do people get really fat? and why?

Anonymous
i need to lose some weight myself but even with not getting enough exercise, needing to improve some parts of my diet, and eating enough that I am generally full I still am not super obese... just like 20-30 pounds above what I should be, and I should work out more.

And my metabolism is on the slower end. I don't understand how some people get INSANELY fat.
How do people get really fat? and why?
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