There are thousands of books full of valid, yet conflicting advice on how to make money, but relatively few on how to lose it.
Works the same way with your health.
Low fat vs. low carb, intermittent fasting vs. frequent meals, big important breakfast vs. skipping breakfast. Despair at the countless, contradictory principles intended to improve health.
Or understand the few heuristics guaranteed to worsen it:
Eat foods with added sugar. Delicious!
Drink anything besides water, tea, or coffee. Accelerate the process with alcohol. Fun!
Sit as much as possible. Relaxing!
Let somebody else do the cooking. Convenient!