In the UK we are fairly obese and we don't grow corn, we don't have HFCS subsidies, and we don't have have HFCS in everything either - eg coca cola is just plai

In the UK we are fairly obese and we don't grow corn, we don't have HFCS subsidies, and we don't have have HFCS in everything either - eg coca cola is just plain old sugar here. So I doubt that the US getting rid of corn subsidies will make any difference to obesity - some other sugar would be used instead, sugar cane or sugar beet.