I’ve heard stories of people who’ve been overweight that’d never see lengthy lives because the burden of weight would be too much.

Absolute fear mongering! I see lots of people who comfortable being fat their whole lives and live a normal lifespan.

The hardest part from my experience of being slightly overweight is that it is harder to feel ready for any type of exercise, and I also got tired more quickly just from pulling the weight around when I walked to places.