Bullshit. Heart disease and cancer (and a long tail of medical problems) cook up with age and kill ~everyone inside ~100 years. If you think that environment and exercise can fix this, show me the person who is 200 years old.
We would have to 100x medical research spending before it was clearly overdone.
Obviously healthy habits prolong your life. Nobody argued otherwise. My contention is specifically with the idea that they matter to the exclusion of science and pharma. Healthy habits clearly hit a wall: if they didn't, we would have health and fitness gurus living to 200 and beyond by virtue of having a routine that could actually defeat cancer and heart disease. The absence of these 200 year old gurus indicates that no, 80% of cancer (and heart disease, everyone always forgets heart disease) cannot be avoided with diet and exercise. Hence, work on getting through the wall is valuable.
You can 1000x the research if you want, a 50kg overweight person who doesn't exercise, drink alcohol and lives next to a highway is statistically fucked no matter what. You'd need straight up magic to undo the damages
You're not going to fix lifestyle diseases with drugs, and lifestyle diseases are the leading cause of death
We would have to 100x medical research spending before it was clearly overdone.