Doctors? Research studies? Not from some 16th century English religious movement. I don't know why so many people on this site try to harp on this.

Your parent says that it is part of the Puritan ideal to be healthy more so than maybe in other religions or belief systems.

He is suggesting your desire to be healthy comes from this.

Mine came from feeling like junk even after 1 beer/wine/cocktail the next day. I experimented with thinking it was an allergy to grains, allergy to hops, wine quality - but I think it's just alcohol.

Could be, but in general Americans obsess more about health than other nations, which also can be traced back to our Puritanical heritage.

I'm not sure if you're serious with both your arguments here: Americans obsess with their health? They have one of the highest rates of obesity globally ...

Likewise, how does this have anything to do with religion (Puritanical heritage)?

I'd never heard that Puritans had any obsession with body health. What is the connection?

Mostly as a connection between sin and disease- physical sickness was seen as a reflection of spiritual sickness.