This is an adaptation period, where we're essentially re-training our muscles and our brain to use fat as the primary fuel source instead of glucose. This adaptation can take a couple of weeks to a couple of months. As a hallmark of being keto-adapted and not just in ketosis, the skeletal muscles are able to burn fat directly for fuel, and the brain relies on the higher volume of ketones in the blood as its main source of energy.
For endurance athletes, the transition to a ketogenic diet may reduce recovery time after training, but for casual exercisers, the transition to the ketogenic diet may make sticking with your fitness routine a challenge at first. (10) If you feel your energy levels drop too much when starting the ketogenic diet, slow down your reduction of carbohydrates, making sure to do it over time rather than all at once.
Sharon M. Nickols-Richardson, PhD, RD, , Mary Dean Coleman, PhD, RD, Joanne J. Volpe, Kathy W. Hosig, PhD, MPH, RD, œPerceived Hunger Is Lower and Weight Loss Is Greater in Overweight Premenopausal Women Consuming a Low-Carbohydrate/High-Protein vs High-Carbohydrate/Low-Fat Diet, The Journal of Pediatrics: Vol 105, Issue 9: 1433“1437; September 2005. http://www.sciencedirect.com/science/article/pii/S000282230501151X.
Here are a few of the most common side effects that I come across when people first start keto. Frequently the issues relate to dehydration or lack of micronutrients (vitamins) in the body. Make sure that you're drinking enough water (close to a gallon a day) and eating foods with good sources of micronutrients. To read more on micronutrients, click here >
The macronutrient ratios for the keto diet can range between 65-90% fat, 5-25% protein, 4-10% carbohydrates depending on the person. Those are actually pretty large ranges, so they deserve an explanation. There are a lot of details that come into play to calculate your macros for ketosis including your current weight, target weight, exercise frequency, and more.
To see whether I was a good fit for the keto diet, Wali requested I have some lab work done, including a cholesterol panel and a fasting-insulin-level test. My results came back normal, meaning there was no medical necessity for me to go on the diet. If I were pre-diabetic or insulin-resistant, Wali would likely have made the keto diet part of my treatment.
For some, ketosis can cause more negative than positive side effects. Dorena Rode, a 52-year-old author, and speaker from Occidental, California, tried the diet for a month and experienced heart palpitations and dizziness. Unlike Drew, Rode says her cholesterol increased from 192 to 250 mg/dL after she introduced more fat into her diet. (Less than 200 mg/dL is considered desirable, while anything over 240 mg/dL is considered high.)
I've always heard that the brain functions well on ketones. Gluconeogenisis typically reduces ketosis, though as well? This is the first time I've heard anyone say the brain can't use anything but glucose. I know there's *preferred* sources of fuel over others, but I was also fairly certain other sources were fine.. or humans might be in a bit of trouble.
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