How to live longer: Five diet tips to boost life expectancy

But new research, published this week, has found the times of day a person eats holds the most benefits.

Dr Mark Mattson, a professor of neuroscience at John Hopkins University School of Medicine, in the US, has said “intermittent fasting could be part of a healthy lifestyle."

Intermittent fasting diets usually involve daily time-restricted feeding, which narrows eating times to six to eight hours per day and so-called 5:2 intermittent fasting, in which people limit themselves to one moderate-sized meal two days each week.

A range of human and animal studies have shown that alternating between times of fasting and eating supports cellular health, probably by triggering an age-old adaptation to periods of food scarcity called metabolic switching.

READ MORE: Type 2 diabetes symptoms: How often do you go to the toilet? Warning sign of the condition