FTA:
"A study of over 20,000 adults found that those who followed an 8-hour time-restricted eating schedule, a type of intermittent fasting, had a 91% higher risk of death from cardiovascular disease.
People with heart disease or cancer also had an increased risk of cardiovascular death.
Compared with a standard schedule of eating across 12-16 hours per day, limiting food intake to less than 8 hours per day was not associated with living longer."
Idk if your one anecdote is enough to say “its not how or when you eat”.
Its entirely possible intermittent fasting is useful, even though your guy you know eats like shit so much to undo the potential good.