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>There is no evidence of the existence of people who can eat whatever they want and stay skinny.

Sure there is. They're called 18 year olds. Sadly the effect fades at round 25.

Yes, your metabolism declines as you age. It's not that 18-year-olds can eat whatever they want and not gain weight, it's that 18 is the age where most people settle into eating habits based on their equilibrium at that time. As their daily expenditure slows by roughly 150 calories per decade, they don't adjust their eating habits and slowly gain weight.

The shockingly large and increasing incidence of adolescent onset T2 diabetes disagrees with this.

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