For healthy, regularly training adults, exercise-science bodies commonly use a range of 1.4 to 2.0 grams of protein per kilogram of body weight per day — per the International Society of Sports Nutrition's 2017 position stand (Jäger et al., Journal of the International Society of Sports Nutrition) — compared with the U.S. recommended dietary allowance of 0.8 grams per kilogram, set by the Institute of Medicine for the general population. Best Health Info publishes information, not medical advice; readers with kidney conditions, diabetes, or other medical concerns should talk with a clinician or registered dietitian before changing intake.
The number matters less than people think; the pattern matters more. Most recreational athletes who eat three meals with a protein source already land in the range. The gap usually isn't total protein — it's spacing.
Where does the 1.4–2.0 range come from?
Position stands, not marketing. The ISSN's 2017 stand, authored by Jäger and colleagues, summarizes decades of nitrogen-balance and training studies and concludes that range covers most exercising adults, with higher ends for heavier training volumes. The American College of Sports Medicine, in its nutrition and athletic performance guidance (2016, with the Academy of Nutrition and Dietetics), uses a similar 1.2 to 2.0 grams per kilogram band for athletes. Both bodies are named, dated, and publicly available — that is the standard a claim has to meet on this site.
Translate the arithmetic once and be done: a 70-kilogram (154-pound) adult at 1.6 grams per kilogram needs about 112 grams of protein a day. For scale, a chicken breast carries roughly 30 grams, a cup of Greek yogurt about 17 to 20, three eggs about 18 — figures per USDA FoodData Central entries.
Does timing matter — the anabolic window?
Less than supplement shelves imply. A 2013 review by Alan Aragon and Brad Schoenfeld in the Journal of the International Society of Sports Nutrition concluded that total daily protein was the primary driver, with the post-workout window a matter of hours rather than minutes for most people eating mixed meals through the day. The acute muscle-protein-response research (notably Luc van Loon's group's work at Maastricht University) supports a per-meal dose around 20 to 40 grams to maximally stimulate muscle protein synthesis — which is a distribution insight, not a stopwatch rule.
Practical translation: put a protein source in each meal, train whenever suits your life, and stop arranging your day around a shaker bottle. The window is wide enough to walk through.
What about protein before bed?
The evidence is modest and honest about it. Trials of pre-sleep casein — notably a 2015 study by Snijders and colleagues at Maastricht University — reported modest improvements in strength and mass gains versus a placebo group, but the samples were small and the effect size debated in follow-up literature. Pre-sleep protein is a reasonable, low-cost tactic if total intake needs help. It is not a lever with a large documented effect, and this site won't sell it as one.
How do you actually apply the range?
A four-step sequence, using the cited sources' framing:
- Convert your weight to kilograms (pounds divided by 2.2).
- Start near 1.6 grams per kilogram — the middle of the ISSN range — and adjust within 1.4–2.0 for training volume and hunger.
- Check distribution: 20 to 40 grams per meal across three or four meals, per the muscle-protein-response research.
- Reassess monthly against performance and recovery, not daily against a spreadsheet.
What didn't the sources establish?
That more is always better — intakes above the range show no documented additional benefit in the position stands. That supplements outperform food — the ISSN stand states whole-food protein can fully meet needs. And any claim tying a specific product to body-composition change belongs to whoever proved it, which is usually no one. Your total daily protein, spread across the day, from foods you already eat: that is the whole recommendation the evidence supports. The rest is packaging.
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For more context, read How Much Protein Do You Actually Need to Build Muscle?.
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