Dr. Eric Berg is an American ketogenic diet advocate with a 5-million-subscription YouTube channel.

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Ketogenic Diet is still in a debatable dietary habit.

British Dietetic Association (BDA) included the ketogenic diet in their list of "Top 5 worst celeb diets to avoid in 2018". According to the BDA: 

A carefully dietitian-planned ketogenic diet can be a very effective treatment for people with epilepsy. For weight loss, there's no magic, the diet works like any other by cutting total calories and removing foods people tend to overeat. Initial side effects may include low energy levels, brain fog, increased hunger, sleep problems, nausea, digestive discomfort, bad breath and poor exercise performance. It can be an effective method of weight loss in the short term with careful planning but it is hard to sustain for many in the long term and most of the initial weight loss seen is often associated with water/fluid losses. It is never a good idea to ‘over-restrict’ any one food group (including carbohydrate), as this can mean it is more difficult to achieve a balanced diet overall with respect to vitamins, minerals and fibre in particular.
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However, Dr. Berg posts videos addressing plans to achieve a balanced diet. He is open to Q&A and people who criticize.

We think Dr. Berg's videos bring you a concrete idea on Ketogenic Diet, and a lot of useful information on ways to tailor the best dietary plan for yourselves.