Calorie Restriction (CR): As the name suggests, this diet restricts your calorie intake by 20-40% lower than what’s recommended. It has caused a lot of controversy but some scientists believe that it’s the secret to prolonging life.
PROS: It will take further scientific research to prove whether this diet really will increase lifespan.
CONS: It’s a long-term lifestyle, so you need to be committed. If you don’t ensure you’re getting all the right nutrients, this diet will do you a lot more harm than good.