¢ Increasing muscle mass ” Jeff Volek, Ph.D., is a registered dietitian specializing in how a high-fat, low-carb diet can affect health and athletic performance. He's written many scientific articles on this topic, as well as two books, and he explains that ketones have a similar structure to branched-chain amino acids that can be useful for building muscle mass. Ketones spare these amino acids, leaving higher levels of them around, which can help promote muscle mass.
This means that if you have risk factors for heart disease ” such as elevated cholesterol levels, high blood pressure (hypertension), or a strong family history of the disease ” you should use caution when following this diet. The diet's heavy reliance on fat, especially saturated fat, can elevate cholesterol levels, further increasing your chances of developing heart disease in the future. (7)
¢ Reducing appetite ” Constant hunger can cause you to consume more calories than you can burn, which can eventually lead to weight gain. A ketogenic diet can help you avoid this problem because reducing carbohydrate consumption can reduce hunger symptoms. In one study, participants who were given a low-carbohydrate diet had reduced appetites, helping them lose weight easier.2
In order to transition and remain in ketosis, aiming for about 30“50 net grams is typically the recommended amount of total carbs to start with. This is considered a more moderate or flexible approach but can be less overwhelming to begin with. Once you're more accustomed to œeating keto, you can choose to lower carbs even more if you'd like (perhaps only from time to time), down to about 20 grams of net carbs daily. This is considered the standard, œstrict amount that many keto dieters aim to adhere to for best results, but remember that everyone is a bit different.
As of the moment, there is no industry standard as to how many calories should be consumed in a restricted ketogenic diet, but there are published studies that provide estimates. In one example, a 65-year-old woman who was suffering from glioblastoma multiforme (GBM), an aggressive type of brain cancer, was put into a restricted ketogenic diet that started with water fasting and then proceeded to consuming 600 calories a day only.
When you're first getting started, it can be helpful to use a blood or breath ketone meter. What these meters do is measure the amount of ketones (the energy source your body is switching to) in your blood or your breath. Knowing those amounts and seeing how they increase or decrease depending on what you're eating daily can often be a motivating and helpful indicator of the transition occurring in your body.
This process of burning fat provides more benefits than simply helping us to shed extra weight ” it also helps control the release of hormones like insulin, which plays a role in development of diabetes and other health problems. When we eat carbohydrates, insulin is released as a reaction to elevated blood glucose (an increase in sugar circulating in our blood) and insulin levels rise. Insulin is a œstorage hormone that signals cells to store as much available energy as possible, initially as glycogen (aka stored carbohydrates in our muscles) and then as body fat.
Therefore, when you're following a ketogenic diet, your body is burning fat for energy rather than carbohydrates, so in the process most people lose weight and excess body fat rapidly, even when consuming lots of fat and adequate calories through their diet. Another major benefit of the keto diet is that there's no need to count calories, feel hungry or attempt to burn loads of calories through hours of intense exercise.
Gary D. Foster, Ph.D., Holly R. Wyatt, M.D., James O. Hill, Ph.D., Brian G. McGuckin, Ed.M., Carrie Brill, B.S., B. Selma Mohammed, M.D., Ph.D., Philippe O. Szapary, M.D., Daniel J. Rader, M.D., Joel S. Edman, D.Sc., and Samuel Klein, M.D., œA Randomized Trial of a Low-Carbohydrate Diet for Obesity ” NEJM, N Engl J Med 2003; 348:2082- 2090. http://www.nejm.org/doi/full/10.1056/NEJMoa022207.
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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