Following the plan can help some people shape up, according to fitness expert Daniel Herman.
He said: "A keto or ketogenic diet is a very low-carb diet (not no carb), which turns the body into a fat-burning machine.
"It has many proven benefits for weight loss, health and performance, as millions of people have experienced already."
The diet is thought to help the body enter into the fat-burning state called ketosis.
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This can boost the metabolism and speed up weight loss results, Daniel explained.
He continued: "The 'keto' in a ketogenic diet comes from the fact that it makes the body produce small fuel molecules called 'ketones'.
"This is an alternative fuel for the body, used when blood sugar (glucose) is in short supply.
"On a ketogenic diet, your entire body switches its fuel supply to run almost entirely on fat.
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"Insulin levels become very low, and fat burning increases dramatically. It becomes easy to access your fat stores to burn them off.
"This is obviously great if youre trying to lose weight, but there are also other less obvious benefits, such as less hunger and a steady supply of energy.
"A keto diet can be eaten indefinitely and also results in ketosis. It has many of the benefits of fasting including weight loss without having to fast."
By entering ketosis, Daniel suggested the body can start to burn fat quickly.
Dieters should avoid pasta, rice, bread, sugary fruits and sweet treats.
Daniel added: "In summary, eat really low carb foods like meat, fish, eggs, vegetables and natural fats like butter or olive oil.
"As a basic beginners rule, stick to foods with fewer than five percent carbs."
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