Dr. Phil Shares: The Impact of Ketogenic Diet on Body Composition During Resistance Training

Ketogenic protocols have become an important therapeutic option for a variety of health issues including weight management, cardiometabolic dysfunction, and epilepsy.1 The potential of the ketogenic diet (KD) to help optimize body mass has important implications for the reduction of metabolic syndrome and its related chronic disease aspects such as heart disease, fatty liver, and type 2 diabetes (T2D).

Additionally, the ketogenic dietary approach has gained widespread attention within the professional sports performance and wellness communities for its ability to enhance weight loss and optimize body composition, both critical components in accomplishing training goals for this population.2-3 However, concerns exist in the sports performance community regarding the impact of a KD, including the possibility that lowering total body mass may reduce the ability of an individual to optimize muscle hypertrophy through resistance training (RT) due to increased central fatigue and other related factors.3

To learn more about the effects of a KD in combination with RT, a randomized, controlled, parallel arm, prospective study was conducted, with results published in the Journal of International Society of Sports Nutrition.3 The study’s authors hypothesized that, “a KD with caloric surplus in combination with RT in trained men would have a positive impact in fat reduction, and it would benefit the gains in lean body mass (LBM)”.3

Healthy, athletic men (N=24) from Spain (average age: 30, weight: 76.7kg, BMI: 23.4) with at least 2 years of continuous overload training experience were randomized into 1 of 3 groups: KD, non-KD, or control group.3 The participants followed their approved diets for 8 weeks along with supervised hypertrophy training protocol 4 days/week: 2 days of upper body and 2 days of lower body workouts. The KD group was monitored weekly by measuring urinary ketones with reagent strips to ensure they achieved and remained in ketosis. Body composition was assessed using DXA.

Participants all consumed a similar number of calories, which was set for a moderate energy surplus of 39 kcal/kg/day.3 The KD group consumed 20% of calories as protein (2g/kg/day), 70% as fat (3.2g/kg/d), and <10% of their calories as carbohydrates (approximately 42g/d).3 The non-KD consumed the same 20% of calories as protein (2g/kg/day), 25% as fat, and the remaining 55% as carbohydrates.3 Both groups were encouraged to eat 3-6 meals per day, and individuals in the control group were asked to maintain their current exercise and dietary routines throughout the study.

Results:3

  • KD: ↓ fat mass (FM) and ↓ visceral adipose tissue (VAT); non-significant reduction in total body weight; non-significant increase in lean body mass (LBM)
  • Non-KD: No significant changes in FM or VAT; significant ↑ in total body weight and ↑ LBM
  • Control: No significant changes in FM, VAT, total body weight, nor LBM

The overall results indicate the KD intervention was able to achieve a positive change in body composition with a decrease in body weight (non-significant) and reduction in FM and VAT.3 LBM did not increase significantly in the KD group, and the results indicate that LBM may be enhanced through an adequate carbohydrate intake (as was provided in the non-KD and control group diet protocols of this study) while also consuming a calorie surplus with a higher protein intake to support muscle hypertrophy.3

In summary, the implementation of a KD in male athletes taking part in regular resistance training may lead to lowering of VAT and FM, both important factors for body mass optimization and reducing risk of cardiometabolic disease processes.3 However, the lack of lean body mass accrual in this study indicates that the KD  may not be an optimal strategy for building muscle mass in trained athletes when utilized alongside a resistance training program.3 Longer study duration with larger samples, both genders, and less fit individuals (e.g. overweight) would be valuable for further exploration.

Why is this Clinically Relevant?

  • KD in trained men combined with resistance training protocols may improve VAT and FM levels, both risk factors for cardiovascular disease3
  • Trained men desiring to increase LBM and increase muscle hypertrophy may need to consider a dietary approach which includes a calorie surplus with high protein content along with adequate carbohydrate intake

View the article

Citations

  1. Paoli A et al. Beyond weight loss: a review of the therapeutic uses of very-low-carbohydrate (ketogenic) diets. Eur J Clin Nutr. 2013;67(8):789–796.
  2. McSwiney FT, Wardrop B, Hyde PN, Lafountain RA, Volek JS, Doyle L. Keto-adaptation enhances exercise performance and body composition responses to training in endurance athletes. Metabolism. 2018;81:25-34.
  3. * Vargas S, Romance R, Petro J, et al. Efficacy of ketogenic diet on body composition during resistance training in trained men: a randomized controlled trial. J Int Soc Sports Nutr. 2018;15:31.

*Note: In the Vargas S et al. 2018 article, there are discrepancies in body composition outcomes in the written Results section of the article, however, the quantitative results in Table 2 and the Abstract are correct and are summarized above.

Shared by Dr. Phil McAllister @ Forward Health Guelph

Written by Bianca Garilli, ND

Dr. Phil Shares: 10 Reasons Why Weight Lifting Is Great for Women

10 Reasons Why Weight Lifting Is Great for Women

10 Benefits of Strength Training for Women

When you’re weight training, you shouldn’t rely exclusively on the scale to gauge your progress. You can use a body fat tester or a tape measure to track how many inches you’re losing.

The size of your body will shrink as you shed fat and build muscle, but your weight may not change as dramatically as you expect. Besides, what’s more important, the number on the scale or how you look in selfies?

If you’re still not convinced that you need to lift weights, here are 10 reasons you should reconsider.

1. Burn More Fat

Researchers at Tufts University found that when overweight women lifted heavy weights twice a week, they lost an average of 14.6 pounds of fat and gained 1.4 pounds of muscle.

The control group, women who dieted but didn’t lift weights, lost only 9.2 pounds of fat and gained no muscle.

When you do an intense weight-training program, your metabolism stays elevated and you continue to burn fat for several hours after working out. During regular cardio exercise, you stop burning fat shortly after the workout.

2. Change Your Body Shape

You may think your genes determine how you look. That’s not necessarily true. Weight training can slim you down, create new curves, and help avoid the “middle-age spread.”

So, no, you won’t bulk up — women don’t have enough muscle-building hormones to gain a lot of mass like men do. If you keep your diet clean and create a calorie deficit, you’ll burn fat.

3. Boost Your Metabolism

The less muscle you have, the slower your metabolism will be. As women age, they lose muscle at increasing rates, especially after the age of 40. When you diet without doing resistance training, up to 25 percent of the weight loss may be muscle loss.

Weight training while dieting can help you preserve and even rebuild muscle fibers. The more lean mass you have, the higher your metabolism will be and the more calories you’ll burn all day long.

4. Get Stronger and More Confident

Lifting weights increases functional fitness, which makes everyday tasks such as carrying children, lifting grocery bags, and picking up heavy suitcases much easier.

According to the Mayo Clinic, regular weight training can make you 50 percent stronger in 6 months. Being strong is also empowering. Not only does it improve your physical activities, it builds emotional strength by boosting self-esteem and confidence.

5. Build Strong Bones

It’s been well documented that women need to do weight-bearing exercise to build and maintain bone mass. Just as muscles get stronger and bigger with use, so do bones when they’re made to bear weight.

Stronger bones and increased muscle mass also lead to better flexibility and balance, which is especially important for women as they age.

6. Improve Mood

You’ve probably heard that cardio and low-impact exercises such as yoga help improve mood; weight lifting has the same effect. The endorphins that are released during aerobic activities are also present during resistance training.

7. Improve Sports Fitness

You don’t have to be an athlete to get the sports benefit of weight training. Improved muscle mass and strength will help you in all physical activities, whether it’s bicycling with the family, swimming, golfing, or skiing… whatever sport you enjoy.

8. Reduce Injuries 

Weightlifting improves joint stability and builds stronger ligaments and tendons. Training safely and with proper form can help decrease the likelihood of injuries in your daily life.

It can also improve physical function in people with arthritis. A study conducted at the University of Wales in Bangor, United Kingdom, found that mildly disabled participants who lifted weights for 12 weeks increased the frequency and intensity at which they could work, with less pain and increased range of movement.

9. Get Heart Healthy

More than 480,000 women die from cardiovascular disease each year, making it the number-one killer of women over the age of 25. Most people don’t realize that pumping iron can also keep your heart pumping.

Lifting weights increases your “good” (HDL) cholesterol and decreases your “bad” (LDL) cholesterol. It also lowers your blood pressure. The Journal of the American Medical Association reports that people who do 30 minutes of weight lifting each week have a 23 percent reduced risk of developing heart disease compared to those who don’t lift weights.

10. Maintain Healthy Blood Sugar Levels

In addition to keeping your ticker strong, weight training can improve glucose utilization (the way your body processes sugar) by as much as 23 percent.

According to the Centers for Disease Control and Prevention, 16 weeks of strength training can improve glucose metabolism in a way that is comparable to taking medication. The more lean mass you have, the more efficient your body is at removing glucose from the blood.

Shared by Dr. Phil McAllister @ Forward Health Guelph