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Ketogenic (keto) diet — In a typical keto diet plan, approximately 70% to 75% of daily calories come from fat, 20% from protein, and no more than 10% from carbohydrates
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Carnivore diet — It's sometimes called the "zero carb" diet. You only eat meat, poultry, eggs, fish, and dairy. The long list of foods not allowed includes all vegetables, fruit, grains, legumes, seeds, and nuts
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Paleo diet — The paleo approach centers on the unprocessed, truly natural foods humans consumed through hunting and gathering in the Paleolithic era, which ended about 10,000 years ago. The food choices can come from meat, fish, poultry, eggs, vegetables, fruits, and nuts. Any refined or artificial products (including healthy oils like olive oil)
The pros and cons of a keto diet depend on your goal. If you want to jump-start a weight-loss program, a keto diet can help you lose five to 10 pounds or more. The downside, even for the short term, is a potential rise in LDL (bad) cholesterol. Personally, I have concerns about staying in ketosis for more than four to six weeks. Longer-term use of a keto diet is linked to a higher risk of kidney stones, osteoporosis, and gout.
Finally, given the overwhelming evidence supporting the benefits of a plant-based diet, I would never recommend a carnivore diet.