The revolutionary weight-loss plan restricts calorie intake for 48 hours, like the 48 Hour Diet by top nutritionist Amanda Hamilton, published last week.
She shared her easy to follow plan which promises to not just shift the pounds but improve general health and mental wellbeing.
Researchers have backed her methods of intermittent fasting and say it is as effective as weight loss surgery, without the cost or risk.
The scientific review suggests fasting diets may help those with diabetes and cardiovascular disease.
A review published in the British Journal of Diabetes and Vascular Disease by a team led by James Brown from Aston University in the West Midlands highlights evidence from clinical trials which shows fasting can limit inflammation, improve levels of sugars and fats in your circulation and cut blood pressure.
By fasting, the body is more efficient in selecting which fuel to burn, improving metabolism.
The plan is to restrict calories on alternative days or on two specific days each week which are classed as "fasting days."
On these, women usually aim to consume less than 500 calories and men less than 600.
This type of intermittent fasting has been shown in trials to be at least as effective as counting calories every day to lose weight.
Scientists have known since the 1940s that intermittent fasting can cut the incidence of diabetes after trials on animals.
But recent studies have also confirmed that cutting calorie intake could reverse Type 2 diabetes in some people.
It could also help fight conditions such as dementia and Alzheimer's disease.
Researchers measured improved pancreatic function and found fewer fatty deposits associated with insulin resistance present in those fasting.
Scientists say it has some cardiovascular benefits that appear similar to exercising, such as improving blood pressure and heart rate and lowering cholesterol.