This diet has been around since the late 1960's. It works great for me. I'm on it right now and have lost 15 pounds since Jan 1. I've never had the dizzy spells but have heard of that happening. If you love meat eggs, fish and fat you will love this diet. Basically, as I understand it, carbohydrates create insulin which makes the body store fat. Without carbs, minimal fat is stored so you can eat high protein foods and not worry about the calories from fat. Carbs and sugar are your enemies. This means no fruit(except strawberries), candy, breads, fruit juices, non-diet soda, etc. There is a book called Protein Power, which I guess is the most modern version of the diet. It includes lots of info on the diet and the carb content of just about every kind of food. You can also check out the Atkins Diet Web site for more info. It also is important to take lots of vitamins. You should also consult with your doctor. Mine told me I was nuts but I ignored her because I think it made sense and I only do it from January to March to lose the 15 pounds I always manage to gain over the rest or the year. During race season, I don't do it. I would think that the lack of carbs and potassium under the stress of an enduro would make you cramp up and do other evil things. Good luck.