The keto diet has some baggage to it. It often causes low blood pressure, kidney stones, constipation, nutrient deficiencies and an increased risk of heart disease.
The keto diet is primarily used to help reduce the frequency of epileptic seizures in children. While it also has been tried for weight loss, only short-term results have been studied, and the results have been mixed. We don’t know if it works in the long term, nor whether it’s safe,” warns registered dietitian Kathy McManus, director of the Department of Nutrition at Harvard-affiliated Brigham and Women’s Hospital.
https://www.health.harvard.edu/staying-healthy/should-you-try-the-keto-diet
Additionally, Keto is not safe for those with any conditions involving their pancreas, liver, thyroid or gallbladder.
Be careful with this one. A low carb diet is like putting very low octane gas in the car. It runs out of power rapidly. Had a doc friend try it and he had to start cutting his run down because he got exhausted and couldn’t finish it. He got off the diet and was able to exercise better.
wy69
It is true you do not get bursts of blood sugar with keto, but if you want high blood sugar availability, don't do keto. You can break ketosis in a few minutes of eating carbs, so go do your run, then.
There are other benefits with the keto diet, outside of long range running.
Your Dr. friend wasn’t sufficiently fat adapted.
I frequently row over 10k and put it a 1 hr. HIIT workout while fasting—on the same day. I never “hit the wall” when I’m fasting/keto, only if I eat carbs.
Best part—I lost 50 lbs, kept it off for two years and counting and my life-long asthma is gone.