I don't want to get too far down the intermittent fasting helping covid rabbit hole, but that's not the only way to induce Autophagy. A 10-40% calorie restriction (long term, like 3+ years) is the strongest inducer of autophagy. Intense exercise, probably HIIT, also induces it. There are lots of ways to starve cells.
However, it goes also delve into the whole point of overall healthy eating, and any improvements towards that, usually makes people feel better.