Does a high fat, low carb diet improve endurance performance?

I recently hired a nutritionist. She was highly recommended by a friend so I decided to give her a try. I had tried Weight Watchers and some other “diets” and nothing seemed to be working. The only thing I know is that I am not losing weight and I am working out a lot.

Interestingly, she told me I need to start eating more fat and less carbs. “Get fat absorbed and you will burn weight off,” she said.

Then I saw this from Pacific Health Labs:

The argument that a high-fat low-carb diet improves endurance performance is compelling. The average endurance athlete has about 2,000 calories of glycogen in their muscles. Even the leanest marathoner has close to 50,000 calories of fat.

It makes sense that increasing fat consumption at the expense of carbohydrate, would lead to extended endurance since more fuel would be available to working muscles.

Many trainers and nutritionists promote this proposition. Increase the fat, reduce the carbs and exercise performance goes up.

Unfortunately, the scientific evidence does not support this proposition. One study looked at dietary intake and in fat oxidation during exercise. The researchers saw a minimal increase in fat oxidation in subjects on a high fat, low carb diet. The investigators found gender was a far more accurate predictor of fat oxidation by muscle cells.

Females oxidize fat to a greater extent than males.

However other studies have shown an increase in fat metabolism when subjects consumed a high fat low carb diet. But here is the critical issue- does a high fat low carb improve endurance performance? 

If you are not limited by your fuel source (which we are with glycogen), we should be able to exercise longer when the muscles burn fat. However there is no evidence that a high-fat low-carb diet improves endurance performance.

Ten different studies using a variety of exercise protocols, trained versus untrained athletes all came to a similar conclusion. There is no performance advantage in a low-carb high-fat diet. Based on these studies, the answer is clear — A high-fat low-carb diet will not improve endurance.

Interesting since I started to eat this way, I haven’t lost weight and I didn’t see an improvement at all in endurance. So either I’ll stick with it or it’s back to the drawing board for me!

Thanks Pacific Health Labs for providing this research. For more information on Pacific Health Labs go to their website by clicking here. 

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