Protein & Nutrition Blog – Marmels

Bar chart of daily protein in grams per kilogram: the RDA 0.8, average U.S. women 1.1 and men 1.3 aged 40 to 60, research target after 40 at 1.4 and 1.54 for sarcopenia

Protein & Nutrition Blog – Marmels

How Much Protein Do You Need After 40?

by Mo Mandegar, PhD on Sep 22 2026
The nutrition label prints one protein number for everyone: a Daily Value of 50 grams. After 40, the research points somewhere else entirely, 1.2 to 1.6 grams per kilogram of body weight, which is 82 to 109 grams a day for a 150-pound adult. Here is why aging muscle needs a larger signal, and where the shortfall actually sits in a normal day.
Bar chart of protein quality score by source: whey protein isolate 1.09, soy protein concentrate 0.90, pea protein isolate 0.82 and rice protein concentrate 0.37

Protein & Nutrition Blog – Marmels

Whey Protein vs Plant Protein: Which Is Better for Muscle?

by Mo Mandegar, PhD on Sep 10 2026
Ask a supplement aisle whether whey beats plant protein and you get a verdict. Ask a nutrition department and you get a range. Whey isolate does score 1.09 on the Digestible Indispensable Amino Acid Score against 0.82 for pea protein, but a 2025 meta-analysis of 30 randomized controlled trials found no difference in strength or physical performance. Here is where the gap is real, and where it quietly closes.