There seem to be many opposing opinions on how to optimize the natural release of growth hormone for health purposes. Although research has helped to discover how some factors affect growth hormone, I expect that there will continue to be differing opinions and unknowns on how to optimize growth hormone and health. Below is some information for your consideration related to exercise-induced growth hormone.
Fat consumed before exercise
Fat consumed before exercise apparently dampens the release of growth hormone from exercise. Here’s an abstract on a study performed on 11-15 year olds: http://grande.nal.usda.gov/ibids/index.php?. And here’s research on adults that showed fat before exercise dampened growth hormone from exercise: http://jcem.endojournals.org/cgi/content/abstract/76/6/1418
Carbohydrates before and after exercise
Carbohydrates re-supply glycogen in the muscles and liver. Athletes commonly eat carbohydrates as soon as possible after a workout to quickly re-supply glycogen to muscles and the liver, but this may adversely affect exercise-induced release of growth hormone. Unfortunately eating lots of carbohydrates has a tendency to create body fat, release large amounts of insulin, get the physiology “trained” to use sugar instead of fat for fuel, and create swings in energy and mood levels.
There was a research study (which was the same study mentioned above related to fat) that found that carbohydrates before exercise did not affect exercise-induced growth hormone: http://jcem.endojournals.org/cgi/content/abstract/76/6/1418.
Carbohydrates after a workout probably dampen the release of exercise-induced growth hormone. Here is a quote from Peak Performance online website: “It is hard to argue against the use of carbohydrate immediately after training in the few days leading up to a competition, when it is important to ensure that carbohydrate stores in the muscles are fully repleted. However, this is not the best strategy for maintaining the release of human growth hormone (hGH) after exercise, particularly if the carbs have a high glycaemic index, as these (sugary) foods stimulate insulin secretion which, in turn, contributes to a reduction in human growth hormone (hGH). “ Here’s a link to the Peak Performance article: http://www.pponline.co.uk/encyc/human-growth-hormone.html. Here’s a link that discusses research showing that insulin blunts the release of growth hormone: http://www.ncbi.nlm.nih.gov/pubmed/10484056.
Protein before and after exercise
Gabe Mirkin, M.D. has a post that states that there is a special insulin sensitivity during and right after exercise which helps protein to repair damaged tissues; this is the “window of opportunity” that many athletes and body builders refer to after exercise. Consequently a protein meal right after exercise can help muscles recover faster. Dr. Mirkin also mentions that carbs help athletes recover faster too, but I avoid carbs for 2 hours after exercising for my purposes; (I am 57 years old, not involved in competitive athletics, and usually want to minimize the release of insulin.) The post is here: http://www.drmirkin.com/public/ezine060808.html
Arthur DeVany has a contrary opinion and recommends to avoid eating before a workout and to wait for awhile after a workout before eating. See this post: http://www.arthurdevany.com/?p=1097
Becoming dehydrated during exercise
In the last 40 days, I haven’t been drinking as much water during the day after reading a post by Gabe Mirkin, M.D. that suggests that exercise and dehydration may actually improve kidney function. http://www.drmirkin.com:80/public/ezine051808.html . It seems wise to me to occasionally allow the body to adapt to a dehydrated state. However, I still “tank up” before exercising and after exercising.
Becoming dehydrated dampens the release of growth hormone during and after exercise. Here’s one of the studies: http://www.eje-online.org/cgi/content/abstract/145/4/445.