You can get the benefits of good nutrition through a conscientious diet. You cannot reduce your needed sleep to 1hr/day outside of this WYR, believe me I’ve tried.

If you took a part time job for even half of the gained time (25hr/wk) at the federal minimum wage ($7.25/hr) you could get $175/wk to spend purely on nutritious food. Better health is a benefit of better nutrition, but it’s not immediate. Half an hour per day researching a more nutritious diet would outpace the head start from immediate results within a few weeks.

That gives you 3hr/day of pure free time at minimum. Assuming the absolute minimum income. Assuming you don’t quickly learn how to achieve a nutritious diet with less than $175/wk. Assuming you don’t utilize some of your extra time for exercise which will further increase your health. Assuming this extra income does nothing to decrease the amount you currently spend on food.

If you increase that wage to a more typical $15/hr: you can work an extra 10hr/wk for $150/wk to spend on good food, exercise an hour a day, and spend another hour every day learning how do do both of those things better, and still gain 25hr/wk, over 3.5hr/day, of pure free time.