Leucine may help to burn fat but spare muscle wastage: Pilot study

By Nathan Gray

- Last updated on GMT

High altitude climbing can take its toll on the body, leading to muscle wastage as we burn energy
High altitude climbing can take its toll on the body, leading to muscle wastage as we burn energy

Related tags Nutrition

Research in high altitude climbers has suggested that supplementation with the amino acid leucine can help to boost fat burning whilst preventing loss of muscle tissue.

The study, which was conducted on Mt. Everest climbers, adds to the evidence that the amino acid – which is found in many foods, dietary supplements, and energy bars – could help people to burn fat while sustaining muscle tissue during periods of food restriction.

The researchers, led by Dr Wayne Askew from the University of Utah, USA, pointed out that the findings could also help people at lower altitudes who want to lose weight while preserving their lean body mass, or who are elderly and don't eat or exercise enough to maintain strength.

Askew also predicted that consumers might one day see leucine-rich bars on grocery store shelves, especially at high-altitude locations, where high-altitude skiing and climbing activities are popular.

The research was reported at the 242nd National Meeting & Exposition of the American Chemical Society (ACS) in Denver.

Altitude issues

The researchers explained that the extreme weather conditions, low oxygen levels, treacherous terrain and strenuous exercise during such climbs create a huge nutritional challenge.

Askew and co-workers explained that weight loss at high altitude is exactly the opposite problem that is on the minds of millions of people in the United States and other countries, who are trying to shed excess weight.

Climbers often cannot or do not eat enough calories, failing to replenish their bodies with important nutrients. They therefore lose both fat and muscle during climbs, which can endanger their strength and coordination.

“The significant part about this weight loss is that a disproportionate amount comes from the muscle mass,”​ said Askew.

“This can be a problem on long expeditions at high altitude because the longer climbers are there and the higher they go, the weaker they get. The body breaks down the muscle for energy, so climbers don't have it available for moving up the mountain,”​ he added.

Study details

In a pilot study of the feasibility of supplementing the diet of climbers with leucine, the research team studied 10 climbers for six to eight weeks as they ascended Mt. Everest to assess physiological benefits of adding leucine to the climbers' diets.

“We knew that leucine has been shown to help people on very low-calorie, or so-called 'calorie-restricted diets', stay healthy at sea level,”​ said Askew.

“It's one of the components, the building blocks, of protein. But no one had tested whether leucine would help people stay healthy and strong at high altitudes, so we added leucine to specially prepared food bars that we gave to the climbers.”

From base camp on Everest members of the research team measured expedition members' fat and muscle by using an ultrasound device placed on the skin.

The research suggested that the additional leucine may help to prevent the body from breaking down muscle tissue by promoting fat burning when the body was in short supply of energy.

The authors said that one finding that was apparent early on in the study was that the food item in which the leucine was delivered was critically important, noting that the climbers had difficulties consuming the three food bars per day that contained the additional leucine.

Askew stressed that the current findings are from a small pilot study to test the feasibility of leucine supplementation at altitude, so definitive conclusions of its benefits at altitude must await the results of more controlled clinical tests.

The researchers also said that they plan to improve the palatability of the leucine food vehicle in consultation with US military food product developers at Natick Research Development and Engineering Center and conduct a more controlled study at high altitude, possibly with the U.S. Army Institute of Environmental Medicine.

Related news

Show more

Related products

show more

MOROSIL:INGREDIENT OF THE YEAR

MOROSIL:INGREDIENT OF THE YEAR

Content provided by BIONAP BIOACTIVE NATURAL PRODUCTS | 07-Mar-2024 | Product Brochure

MOROSIL™ has won as Ingredient of the Year in the category Weight Management at 2023 Nutraingredient USA. MOROSIL ™ is a standardized extract derived from...

In Weight Management Go Beyond with Slendacor®

In Weight Management Go Beyond with Slendacor®

Content provided by PLT Health Solutions | 22-Feb-2024 | White Paper

Slendacor® is a synergistic, patented formulation of three standardized herbal extracts: turmeric (Curcuma longa), moringa (Moringa oleifera) and curry...

Nootropics Report 2.0: Brain Health Insights

Nootropics Report 2.0: Brain Health Insights

Content provided by dsm-firmenich | 22-Feb-2024 | Insight Guide

The brain health market is constantly growing and evolving, with more consumers looking for innovative ways to support total mind and body wellness.

Polyphenol extracts as weight management catalysts

Polyphenol extracts as weight management catalysts

Content provided by DolCas Biotech, LLC. | 18-Jan-2024 | White Paper

Viable natural product options for "healthy weight management" in the age of Ozempic and other GLP-1 inhibitors will require targeted innovations...

Related suppliers

2 comments

Thousands of supporting reports and pull out one obscure one!

Posted by John,

I guess if anyone looks hard enough they can pull out one negative. Common trait these days.

Report abuse

Negative of Leucine

Posted by Paul Wakfer,

Leucine activates mTOR which inhibits autophagy which is important for recycling damaged/dysfunctional proteins and other cellular components. Ref: http://pmid.us/18425444
Enhanced autophagy is one of the methods by which calorie restriction promotes health and longevity.

Report abuse

Follow us

Products

View more

Webinars