Does the type of protein you eat matter for muscle building?
The type of protein matters per meal for muscle building, but over the long term with resistance training, the difference between soy and animal protein is not demonstrable. With smart combinations and a sufficient total amount, plant-based protein can work just as well.
The type of protein does matter, but less than you might think. Whey protein stimulates muscle building per meal more strongly than casein or soy protein. This is because whey is digested quickly and contains a lot of leucine, the amino acid that acts as a switch for muscle growth. Animal proteins contain on average 32 to 43% essential amino acids; plant-based sources such as oat or lupin protein come in at only 21%. Methionine and lysine, two amino acids that muscles need, are structurally lower in plant-based protein.
Yet that acute difference translates into long-term outcomes less than expected. An analysis of nine studies with 266 participants shows that soy protein, combined with resistance training over at least six weeks, produces comparable gains in muscle mass and strength to whey or other animal proteins: for muscle mass there was no difference (p=0.96), and for bench press there was none either (p=0.90).
For muscle building with resistance training, the recommendation is 1.4 to 2.0 g per kg of body weight per day, spread across portions of 20 to 40 g; do this consistently over a longer period, combined with regular resistance training. On a label, look for 'Proteïne' or 'Protein' and pay attention to grams per serving and grams per kg per day. Whether you choose whey, casein, soy or another source makes no difference in the long run, as long as you reach your total daily dose. If you eat plant-based, combine multiple sources, such as rice and pea protein together, or choose a plant-based protein powder based on that combination; taking larger portions also helps.
A well-planned vegetarian or vegan diet meets all protein needs and is associated on average with lower LDL cholesterol, lower blood pressure, and less cardiovascular disease and type 2 diabetes than an omnivorous diet. The health benefits of plant-based eating therefore extend well beyond muscle.
This answer draws on multiple review studies and one analysis of nine studies combined. The findings on protein quality and amino acid composition are well documented and consistent. Regarding the long-term effects of plant-based proteins during strength training, the total number of participants in the analysis was limited (266 people), which calls for caution. The compensation strategies for plant-based protein have only been tested in humans to a limited extent; that part of the evidence is thinner.
Does a protein snack before bed help with muscle building?
Studies show that 20 to 40 grams of casein before bed measurably increases overnight protein production in young men who do strength training. It remains unclear whether the timing itself makes the difference or simply the extra protein intake overall.
When is the best time to eat protein for your muscles?
Your daily protein intake of up to roughly 1.62 grams per kilogram of body weight is the most important factor for muscle building, but timing also plays a role: whey protein around your workout and casein before bed have the strongest support.
How much protein do I need to maintain my muscle mass?
For most healthy adults who want to maintain their muscle mass, 1.2 to 1.6 grams of protein per kilogram of body weight per day is a well-supported target, especially when combined with strength training.
How much protein can your body use in a single meal?
Your body can use more than 20-25 grams of protein per meal, especially when that protein is combined with carbohydrates and fats. Spread your intake across four meals of approximately 0.4 grams per kilogram of body weight for the best results.
Does extra protein help with losing weight without losing muscle?
Extra protein while losing weight helps: you lose slightly more fat and keep on average around 0.4 kg more muscle mass than on a normal-protein diet. Combine it with strength training for the best result.
Do you live longer by eating less protein, or more?
The ideal protein level differs by stage of life: in middle age less appears to be better, while after the age of 65 getting enough protein is protective. What is clear: choose plant-based protein sources as much as possible and limit processed red meat.