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29.12.2017


Low intensity cardio before breakfast burns more fat if you take some L-phenylalanine

Low intensity cardio before breakfast burns more fat if you take some L-phenylalanine
Low intensity cardio sessions on an empty stomach burn more fat if you take 3 g of the amino acid L-phenylalanine half an hour beforehand. Researchers at the Japanese Meiji [meiji.com] write about this in the Journal of the International Society of Sports Nutrition.

L-Phenylalanine
L-Phenylalanine is an amino acid that is needed for protein synthesis and for the production of insulin and glucagon. Glucagon is a hormone that induces the body to convert glycogen into glucose, proteins into amino acids, and fats into fatty acids.


Low intensity cardio before breakfast burns more fat if you take some L-phenylalanine


L-Phenylalanine is also a building block for a series of stimulatory pep hormones and neurotransmitters, such as adrenalin [epinephrine], noradrenalin [nor-epinephrine] and dopamine. Scientists call this group of substances catecholamines.


Low intensity cardio before breakfast burns more fat if you take some L-phenylalanine


Study
The researchers wondered whether L-phenylalanine could be an effective slimming aid, and decided to answer the question by doing an experiment with 6 participants. The participants had to cycle at 50 percent of their maximal oxygen uptake for an hour on two separate occasions. The participants - healthy men aged between 20 and 40 - did so early in the morning. They had not yet had breakfast.



On one occasion the participants took a placebo 30 minutes before the cycling session started; on the other occasion they took 3 g L-phenylalanine.


Low intensity cardio before breakfast burns more fat if you take some L-phenylalanine


Results
While they were cycling, the concentration of glycerol in the participants’ blood rose considerably more after they had taken a supplement, which would indicate that their fat burning had increased.


Low intensity cardio before breakfast burns more fat if you take some L-phenylalanine


Low intensity cardio before breakfast burns more fat if you take some L-phenylalanine


The glucagon concentration also rose by more when the participants had taken L-phenylalanine.



The respiratory exchange ratio was a little lower at various moments after the participants had taken L-phenylalanine. This is also an indication that their fat burning had increased.


Low intensity cardio before breakfast burns more fat if you take some L-phenylalanine


Conclusion
"In conclusion, pre-exercise ingestion of a phenylalanine supplement significantly accelerated secretion of glucagon during both rest and exercise," the researchers wrote. "Furthermore especially serum glycerol levels increased significantly during exercise, indicating a shift towards fat oxidation."

Source:
J Int Soc Sports Nutr. 2017 Sep 12;14:34.

More:
Tyrosine boosts endurance performance in the summer 10.01.2012
Caffeine more effective slimming component than green tea or tyrosine 25.11.2009

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