Keto Diet

This is a low carb, high fat diet which is similar to the Atkins diet.
You drastically drop carbs and replace them with fat. This puts your body into a ketogenic state called ketosis. This is where your body becomes efficient at burning fat for energy. It also turns fat into ketones which can supply energy to the brain.

The diet causes major reductions in blood sugar and insulin and lowers the risk of heart disease.

there are numerous types of keto diets including:
- Standard (SKD). Typically 75% fat, 20% protein and 5% carbs.
- Cyclical (CKD). Higher carb re-feeds after 5 days of standard.
- Targeted (TKD). You add carbs around workouts.
- High-protein. Similar to standard but less fat (60%), 5% fat and higher protein (35%).

The standard diet is the most researched and most used by people.

Early research has shown that the diet can lower body fat and blood pressure and raise HDL (good) cholesterol. It's being used to treat certain types of cancer, Alzheimer's, epilepsy in children, Parkinson's and Polycystic ovary syndrome although these treatments are in the early stages so no long-term concrete evidence yet.

Dietary concerns - Because your protein intake is very low you can lose muscle which is never a good thing. It's also more difficult to build muscle than for those on a higher protein and carb diet.
As fat is 9cals per gram in opposition to 4cals per gram for protein and carbs, If you don't look carefully at the amount of food you are eating, or you don't exercise regularly you may end up putting quite a bit of weight on.