As a kid, kind of ate whatever, including sugary foods, but I'm not from the US so back then I think I ate less sugar than Americans just as a function of how much sugar there is in American food
Nowadays I try to avoid eating added sugars (i.e. drink my coffee black, no soda, rarely eat deserts), but otherwise eat regular food and try to eat "real meals", like my grandparents would eat when they were my age
That's honestly more a question for physicists and chemists. Biologists in my experience take a lot for granted because they don't really understand the fundamentals on small scales.
It should be fairly simple to take the original price of installing the components of the house and calculate depreciation.
Non-improved value = market value - depreciated home value
Obviously you'd have to keep tracking the improvements over time.