And then there is the controversial NuSi study* (Hall, 2016). This involved 17 individuals confined for 2 months in a metabolic ward and fed two different diets containing identical energy contents but differing in carbohydrate contents – one ‘balanced’ and one ketogenic. After 4 weeks of adaptation to each diet, the subjects had their metabolic rates monitored by two different methods: one using isotope analysis over the last 10 days and the other with continuous indirect calorimetry in a chamber for 24-hrs. The average chamber energy expenditure over 24-hrs was 75 kcal/day greater during the ketogenic diet. Given that the average subject in this study was consuming about 3000 kcal/day, that translates to about a 2% difference. Using the different isotopic method to assess average metabolic rate over the last 10 days of each 4-week study period, the calculated increase in daily energy expenditure on the ketogenic diet was closer to 150 kcal (i.e., 4%).
Do not try to starve yourself. Neglecting to consume sufficient numbers of calories on a regular basis can result in the opposite effects you're looking for and, if sustained, can be life-threatening. If you have attempted to lose weight by skipping multiple meals or drastically reducing your daily calorie intake, speak with a health professional about getting information on eating disorders.
I didn’t realize just how many calories I was consuming, so tracking what I ate helped keep me aware of what I was putting in my mouth. I don’t count calories anymore, but I track macros (protein, carb, and fat grams) to keep my diet balanced and in check. Macros allows me to have my carrots and cake, too! If you’re interested in learning more or want to work together, check out my macro plan options!
Glad you started to work out! It took me to my mid 30’s before I started to workout! Now I do it at least 5 times a week! You feel so much better about yourself and your doing something good!! I’m glad you have a family that supports your healthy eating! Sometimes it can be hard when they don’t!!! Keep up all the great work and keep educating yourself on a healthy lifestyle!
2) We humans vary greatly one from another based upon inherited characteristics such as calories per kg burned by resting muscle (Bogardus 1992), aerobic fitness (Klissorous 1971), and body fat distribution (Bouchard 1990). As postulated in our blog post, it is very possible that we humans also differ in our responses to a well-formulated ketogenic diet, where some people actually experience an increase in metabolic energy use when in nutritional ketosis. Certainly the 2016 NuSI/Hall might offer a rich pile of data to dig through to see if some of those 17 individuals appeared to have an accentuated REE or TEE during the second month of that 300 kcal/day energy restricted diet. Thus one person’s accentuated response to a ketogenic diet may not be reflected in the experience of someone else doing exactly the same thing. We frequently hear stories about this from married couples. N Engl J Med. 1990 May 24;322(21):1477-82.
Switching from carbs to ketones does not happen overnight – it takes weeks of consistently restricting carbs for this process of keto-adaptation to fully occur. But once this process is complete, the body can burn fat at over twice the rate compared to when carbs were a major component of the diet (Phinney 1983, Volek 2016). And this remains true even when comparing highly trained athletes, where we have shown that high-level endurance training in the context of a high carbohydrate diet cannot come close to matching keto-adaptation in giving the body permission to burn fat.
Katie’s weight has been a challenge her entire life. But after having two boys, she reached an all-time high: 253 pounds. That was when she decided to make a change, but it didn’t happen right away. For the next three years, she dieted and bounced between losing and gaining 50 pounds. Her real weight loss journey began in 2009, when she used calorie counting and running to take off 125 pounds. Today, she writes about maintaining that loss, running, being a mother, and managing a bipolar diagnosis. Visit the blog.