 So one of the things in one of these articles that I read that said calorie restriction also forces the body to rely on fuel sources other than glucose, which aging experts think is beneficial for metabolic health and ultimately longevity. A lot of researchers point to a process called autophagy, I think that's how it's pronounced, A-U-T-O-P-H-A-G-Y, where the body eats up malfunctioning parts of cells