Short for ketogenic, keto is a high-fat, moderate protein, low-carb dietthat forces your metabolism into what’s called a state of ketosis. There’s a much more scientific explanation to that, but it basically means that instead of burning carbohydrates (mainly glucose, or sugars), your body switches to burning fat as a primary source for energy.
In order to enter ketosis, you need to reduce your carb intake to almost nothing while increasing your fat intake to almost 70 to 75 percent of your diet. It takes a week of this, more or less, before your body actually enters keto — and you’ll know once it does, because you’ll lose a surprising amount of water weight in the first 2 to 3 weeks. I lost almost 10 pounds in the first month.