Protein Intake - What Women over 40 need to know
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Women over 40 need approximately 2.2g of protein per kilogram of body weight per day — about 1g per pound. This is based on Dr. Stacy Sims's research on female physiology, and is significantly higher than the standard RDA of 0.8g/kg, which was designed only to prevent deficiency. Declining estrogen causes anabolic resistance after 40, meaning your muscles need a stronger protein signal to trigger the same repair response they once managed easily.
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Split your daily target across three meals at 35–40g of protein each. The easiest high-protein foods to hit that threshold: Greek yogurt (17–20g per cup), chicken breast (26g per 3oz), eggs (6g each — aim for 3 at breakfast), cottage cheese (14g per ½ cup), canned tuna (20g per 3oz), and tofu (10g per 3oz). Build each meal around a protein source first, then add everything else around it.
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Yes, but it requires planning. Plant proteins are lower in leucine — the amino acid that directly triggers muscle repair — so add 15% to your daily target to compensate for lower absorption. Prioritize complete plant sources: tofu, tempeh, edamame, and quinoa. Combine legumes with grains to cover your full amino acid profile (rice + beans, hummus + pita, quinoa + lentils). A plant-based protein powder helps close any remaining gaps without dramatically increasing meal volume.
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Leucine is the amino acid that directly switches on muscle protein synthesis. Women over 40 need at least 3g of leucine per meal to trigger that repair response — a threshold that's harder to reach because of anabolic resistance. You get 3g of leucine from a 3oz serving of chicken, salmon, eggs, or cottage cheese. Most plant proteins fall short on their own, which is why food source selection becomes more important with age.