Following a ketogenic diet, your food intake would be roughly 5 to 10 percent carbohydrates, 15 percent protein, and 75 to 80 percent fat. This would be a pretty seismic shift for most people who follow a standard American diet; according to a 2016 report by the CDC, the average American adult’s diet is 50 percent carbohydrates, 16 percent protein, and 34 percent fat. Your average day on a ketogenic diet might include eggs, cheese, assorted meats and small amounts of nuts and avocados, and modest amounts of vegetables that are low in carbs, like spinach and lettuce.
Wondering what fits into a keto diet — and what doesn’t? “It’s so important to know what foods you’ll be eating before you start, and how to incorporate more fats into your diet,” says Kristen Mancinelli, RD, author of The Ketogenic Diet: A Scientifically Proven Approach to Fast, Healthy Weight Loss, who is based in New York City. We asked her for some guidelines.
In terms of weight loss, you may be interested in trying the ketogenic diet because you’ve heard that it can make a big impact right away. And that’s true. “Ketogenic diets will cause you to lose weight within the first week,” says Mattinson. She explains that your body will first use up all of its glycogen stores (the storage form of carbohydrate). With depleted glycogen, you’ll drop water weight. While it can be motivating to see the number on the scale go down (often dramatically), do keep in mind that most of this is water loss initially.