We're the only first world country that still deals with these problems.

Did those countries have 350 million guns floating around or have half their population clinically obese?

Better to ask WHY we have 350 million guns floating around or have half our population clinically obese.

because we have so much food it's dirt cheap and easy for people to go full glutton, and because our culture has been heavily armed for the last two and a half centuries

Y'all dont make your own guns?

Lol

Literally any first world country that isn't the US.

Most countries with universal healthcare still have the providers fund the healthcare or will have private insurance companies involved, so it's not really government funded. Now what countries would you say had success with gun control?