{"id":2350682,"date":"2026-01-22T08:09:55","date_gmt":"2026-01-22T07:09:55","guid":{"rendered":"https:\/\/www.livebetter.eu\/?p=2350682"},"modified":"2026-02-22T11:57:33","modified_gmt":"2026-02-22T10:57:33","slug":"leucine-essential-for-muscle-mass","status":"publish","type":"post","link":"https:\/\/staging2.livebetter.eu\/en\/leucina-fondamentale-per-la-massa-muscolare\/","title":{"rendered":"LEUCINE: ESSENTIAL FOR MUSCLE MASS"},"content":{"rendered":"

LEUCINE IMPORTANCE FOR MUSCLE PROTEIN SYNTHESIS<\/strong><\/p>\n

Summary in two words
\nLeucine is the switch that starts muscle protein synthesis, for which all the other essential amino acids are also needed. The importance of leucine increases with age, when the body requires higher doses to achieve the same muscle synthesis.<\/p>\n

To optimize muscle protein synthesis, it is necessary:
\nChoose high quality protein (animal protein is best, then soy)
\nConsume 1.2 to 1.6 g of protein per kg of body weight (ideal weight) and spread the protein intake over all meals of the day
\nReaching the leucine threshold at each meal (2.5 g adults)
\nover 65, the body needs more protein and more leucine: protein 1.6 g\/kg body weight, 3 g leucine per meal<\/p>\n

HOW PROTEIN SYNTHESIS OCCURS
\n<\/strong>Muscle protein synthesis is the process by which muscle builds new protein to grow, repair, and maintain itself functionally. It occurs continuously, but increases significantly after a protein meal and strength exercise<\/p>\n

Muscle protein synthesis is controlled by a \u201cswitch\u201d inside the cell called mTORC1 (which for convenience will henceforth be called mTOR) that decides whether the muscle should build new protein or remain in maintenance mode. When mTOR is turned off, protein synthesis is low. When mTOR is turned on, the muscle starts making new proteins.<\/p>\n

Leucine is the main nutritional stimulator of mTOR. When the concentration of leucine in blood increases after a meal, mTOR is activated and initiates the process of protein synthesis. (1,2)<\/p>\n

Leucine is an essential amino acid, meaning it is not produced by our body so it is necessary to introduce it through food. It belongs to the branched amino acids, BCAAs.<\/p>\n

IS LEUCINE ENOUGH?
\n<\/strong>Leucine activates the signal that initiates synthesis, but the presence of the other essential amino acids is also necessary because they are the \u201cbuilding blocks\u201d for building the protein. (3) If leucine is present but one or more essential amino acids are missing, the building signal turns on, but synthesis quickly stops. This explains why leucine alone is not sufficient to build new muscle tissue.<\/p>\n

Leucine acts according to a threshold mechanism: below a certain amount per meal, muscle protein synthesis remains low; above the threshold, activation increases markedly.<\/p>\n

In young adults, the threshold is about 2.5 g of leucine per meal, easily reached with 25-30 g of high-quality protein, such as whey (whey protein), eggs, or meat. (4,5)<\/p>\n

Taking more leucine than necessary is not harmful, but it does not produce an additional benefit on protein synthesis.<\/p>\n

LEUCINE AND PROTEIN QUALITY
\n<\/strong>Not all proteins stimulate protein synthesis in the same way. The differences depend on:
\ncontent of essential amino acids
\nleucine content
\ndigestibility and speed of absorption<\/p>\n

Whey protein (whey) is particularly effective because it combines a high percentage of leucine with rapid absorption. Eggs, dairy, meat, and fish also provide complete, leucine-rich proteins.<\/p>\n

Plant proteins, when taken individually, contain less leucine and may be deficient in one or more essential amino acids. Therefore they must be taken in larger amounts (thus more calories) or by combining different sources (grain + legume). Soy is among the few plant proteins with an amino acid profile close to that of animals.<\/p>\n

AGING AND ANABOLIC RESISTANCE
\n<\/strong>A condition called anabolic resistance appears with advancing age: muscle in the elderly responds less to nutritional stimuli and needs a stronger signal to activate protein synthesis. (6)<\/p>\n

For this reason over the age of 65: (7)
\nleucine threshold rises to about 3 g per meal
\n30-40 g of high-quality protein is needed to reach this threshold
\nthe distribution of protein in meals becomes crucial; it is not enough to increase the daily protein intake, it is necessary to make sure that each meal exceeds the leucine threshold.<\/p>\n

Over age 65, it is recommended to consume at least 1.6 g of protein per kg of body weight, considering ideal weight.<\/p>\n

MUSCLE MASS AND LONGEVITY
\n<\/strong>Today we know that muscle mass and strength, are among the strongest predictors of longevity and health. Let's try to understand why muscle is so important:
\n- muscle is a metabolic organ: the liver and muscles are the only stores of glycogen (glucose) in the human body. Therefore, the more muscle mass we have, the better we can manage blood glucose (excess blood glucose). This results in better insulin sensitivity and thus reduction of metabolic diseases such as diabetes
\n- muscle is now considered an endocrine organ, secreting myokines that decrease inflammation and improve immune function and brain health
\n- muscle contraction increases bone density, meaning fewer fractures, a major issue in old age
\n- Having good muscles allows you to maintain your autonomy
\n- strength training needed to maintain good muscle mass also works on balance, decreasing the risk of falls
\n- muscle is a reservoir of protein, during an illness people with greater muscle mass are more likely to survive (8)<\/p>\n

SUPPLEMENTATION WITH ESSENTIAL AMINO ACIDS
\n<\/strong>If you are taking essential amino acids in a protein-free\/poor meal, you need to pay attention that to the amount of leucine in your intake. The threshold for activating muscle protein synthesis is:
\n2.5 g up to age 65
\n3 g over 65 years old<\/p>\n

If essential amino acids make up the entire protein intake, the total amount of essential amino acids will have to be:
\n8-10 grams up to age 65, including at least 2.5 g leucine (6)
\n10-12 grams over 65, including at least 3 g leucine (7)<\/p>\n

FOODS WITH LEUCINE
\n<\/strong>The absolute richest food in leucine is whey, whey protein. To get 2.5 grams of leucine, 20 grams of whey, which contain only 78 calories, is sufficient. In this table are the twenty foods most effective in providing 2.5 g of leucine in the lowest caloric intake. In order of increasing caloric intake. In the third column are the grams of food needed to provide 2.5 g of leucine<\/p>\n

\"\"<\/p>\n

The complete list can be viewed at this link<\/a>. For the printable version, click here<\/a>.<\/p>\n

Fact: Whey is prescribed along with slimming drugs as an optimal protein source for maintaining muscle mass during weight loss. Because of this, demand has increased so much, which has led to an increase in price. Just to give you an idea: the purchase cost of whey isolate in the last year has increased by 50%. For this reason I have currently decided to sell only whey concentrates on Live Better (available from February 2026).<\/p>\n

KAISERSCHMARREN LIVE BETTER
\n<\/strong>The kaiserschmarren with 28 g collagen, 3 eggs and 40 g Greek yogurt 0% contains 2.78 g leucine. The savory version with 100 g cottage cheese, 2 eggs, 28 g collagen and 15 g Parmesan contains 3.36 g leucine. In the recipes we will publish in the future, the leucine content will always be indicated.<\/p>\n

For the kaiserschmarren recipe, click here<\/a>.<\/p>\n

HOW MUCH PROTEIN TO CONSUME PER DAY
\n<\/strong>The new U.S. guidelines, the official document based on the latest scientific evidence, recommends that adults consume 1.2-1.6 g of protein per kg of body weight (considering ideal weight). (9)<\/p>\n

Over age 65, anabolic endurance requires more protein, thus 1.6 g\/kg body weight.<\/p>\n

Protein content per 100 grams of food
\n100 g eggs = 12.5 g protein = 143 kcal
\n100 g beef sirloin = 23 g protein = 132 kcal
\n100 g chicken = 21.23 g protein = 114 kcal
\n100 g collagen powder = 93 g protein = 372 kcal
\n100 g sea bream = 18.9 g protein = 105 kcal
\n100 g sea bass = 18.4 g protein = 97 kcal
\n100 g shrimp = 13.6 g protein = 72 kcal
\n100 g squid = 16 g protein = 92 kcal
\n100 g salmon = 20 g protein = 142 kcal
\n100 g anchovies = 20.35 g protein = 131 kcal
\n100 g mackerel = 18.6 g protein = 205 kcal
\n100 g amberjack = 23 g protein = 146 kcal
\n100 g parmesan = 32.4 g protein = 397 kcal
\n100 g emmenthal = 28.5 g protein = 403 kcal
\n100 g pecorino =26 g protein = 409 kcal
\n100 g cow\/buffalo mozzarella = 18.7\/16.7 = kcal 253\/288
\n100 g cow\/sheep ricotta = 8.8\/9.5 g protein = 146\/157 kcal
\n100 g cow\/wheat whole yogurt = 3.8\/6.4 g protein = 66\/115 kcal
\n100 g whole milk = 3.3 g protein = 64 kcal
\n100 g soybean flour = 36.8 g protein = 469 kcal
\n100 g fresh borlotti beans = 10.2 g protein = 143 kcal
\n100 g cooked chickpeas (dry) = 7 g protein = 132 kcal
\n100 g cooked lentils (dried) = 6.9 g protein = 109 kcal
\n100 g fresh\/frozen peas = 5.5 g protein = 64 kcal
\n100 g canned cannellini beans = 6 g protein = 86 kcal
\n100 g tofu = 8 g protein = 76 kcal<\/p>\n

Knowledge means freedom
\nBe Aware, Be Conscious, Live Better
\nBe Informed, Be Aware, Live Better<\/p>\n

DOWNLOAD PDF<\/span><\/a><\/p>\n

BIBLIOGRAPHY
\n<\/strong>1) https:\/\/pubmed.ncbi.nlm.nih.gov\/11015466\/<\/a>
\n2) https:\/\/pubmed.ncbi.nlm.nih.gov\/11015466\/<\/a>
\n3) https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC3424729\/<\/a>
\n4) https:\/\/pubmed.ncbi.nlm.nih.gov\/19056590\/<\/a>
\n5) https:\/\/pubmed.ncbi.nlm.nih.gov\/16424142\/<\/a>
\n6) https:\/\/pubmed.ncbi.nlm.nih.gov\/12885705\/<\/a>
\n7) https:\/\/pubmed.ncbi.nlm.nih.gov\/16507602\/<\/a>
\n8) https:\/\/pubmed.ncbi.nlm.nih.gov\/16960159\/<\/a>
\n9) https:\/\/staging2.livebetter.eu\/le-nuove-linee-guida-alimentari-americane\/<\/a><\/p>\n<\/div><\/div><\/div>

Elena Luzi<\/h3><\/div>

Founder Live Better<\/p>\n<\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":105769,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[481,532],"tags":[],"class_list":["post-2350682","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-approfondimenti","category-proteine"],"acf":[],"yoast_head":"\nLEUCINA: FONDAMENTALE PER LA MASSA MUSCOLARE | Live Better<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LEUCINA: FONDAMENTALE PER LA MASSA MUSCOLARE | Live Better\" \/>\n<meta property=\"og:url\" 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