A few years ago my mother had a stroke and was in ICU. After discharge she went to a convalescent hospital for a few weeks.
The food there was appalling. Sugar and cheap carbs everywhere. Imagine oatmeal with maple syrup and a glass of OJ for breakfast.
So I requested a meeting with the lead dietitian. I told her that I wanted my mother to get bacon and eggs for breakfast, and none of that sugary stuff. Meat or eggs at every meal.
She looked at me like I was from Mars, but ultimately she complied.
Meanwhile, twice a day I brought my mother a whey protein drink I devised, giving her an extra 30-50 g/d protein, plus some NAC and magnesium and creatine.
My mother is still alive today at 99, and probably would not be if she continued eating hospital style.
Calorie restriction (CR) has long been known to extend lifespan and healthspan in animals.
But the benefits of CR may be due to one thing: intermittent fasting.
When calorie restricted, lab animals are typically fed once a day, and they're so hungry, they eat all of their food at once, fasting until their next feeding.
That means that the benefits may be due to fasting, not food restriction.
Fasting alone duplicates many of the metabolic effects of CR.
How long would a human need to fast to get these benefits?