I do not think those are good suggestions for the average person. I've read meta analyses about low caloric intake but not about malnutrition, which in general

I do not think those are good suggestions for the average person. I've read meta analyses about low caloric intake but not about malnutrition, which in general is a bad idea. That being said most people who aren't severely restricting the types of food they eat, and eating healthy food, are unlikely to have significant malnutrition. The lung cancer thing I remember was specifically smokers, so its not straightforward.