Unless you have an actual medical condition, no, there's not an excuse for being fat before 60, you just eat too much. Look at how people eat nowadays and you'll see that it's the same for everybody else: ridiculous over-consumption. Eat less and you'd lose weight like any other normal person (without a medical condition)
I assume by "young" you mean age 60 or under.
> The study, of 6,400 people, from eight days old up to age 95, in 29 countries, suggests the metabolism remains "rock solid" throughout mid-life.
> It peaks at the age of one, is stable from 20 to 60 and then inexorably declines.
https://www.bbc.com/news/health-58186710
Unless you have an actual medical condition, no, there's not an excuse for being fat before 60, you just eat too much. Look at how people eat nowadays and you'll see that it's the same for everybody else: ridiculous over-consumption. Eat less and you'd lose weight like any other normal person (without a medical condition)