Lifestyle

5 Signs You’re Not Getting Enough Protein After 50

By Mike Harper · July 1, 2026

After 50, the body begins losing muscle mass at a rate of approximately 1 to 2% per year — a process called sarcopenia that accelerates with each decade. The primary dietary factor that determines how fast you lose muscle is how much protein you eat. Most Americans over 50 are not eating enough, and the signs show up in ways that are easy to misattribute.

1. You’re losing muscle despite staying active

If you exercise regularly but notice your arms, legs, or overall frame getting thinner or weaker, the issue may not be your workout — it may be your protein intake. Muscle cannot be maintained without adequate amino acids. The recommended dietary allowance for protein is 0.8 grams per kilogram of body weight, but research published in the American Journal of Clinical Nutrition suggests that adults over 50 need 1.0 to 1.2 grams per kilogram to maintain muscle mass. For a 160-pound person, that’s 73 to 87 grams per day — significantly more than the 54 grams the standard RDA suggests.

2. You feel weak or fatigued doing things that used to be easy

Difficulty carrying groceries, struggling to open jars, getting winded climbing stairs you used to take two at a time — these are often attributed to aging when they may reflect a protein deficit. Muscles that aren’t fueled adequately lose both strength and endurance. If activities that were easy a year ago are now noticeably harder, insufficient protein is one of the most treatable possible explanations.

3. Your hair is thinning or your nails are brittle

Hair and nails are made primarily of keratin — a protein. When dietary protein is insufficient, the body prioritizes vital organs over hair and nails. The result is hair that thins, breaks easily, or falls out more than usual, and nails that crack, split, or develop ridges. These cosmetic changes are often the first visible sign of protein insufficiency because the body sacrifices them before it sacrifices anything more important.

4. You’re getting sick more often

The immune system depends on protein to produce antibodies and immune cells. People who are chronically under-consuming protein get sick more frequently, stay sick longer, and recover more slowly from infections and injuries. If you’ve noticed that colds linger, cuts heal slowly, or you’re catching every bug that goes around, protein intake is worth evaluating alongside other factors.

5. You’re always hungry between meals

Protein is the most satiating macronutrient — it keeps you feeling full longer than carbohydrates or fat. If you eat a full meal and feel hungry again within an hour or two, the meal may have been high in carbohydrates and low in protein. Adding 20 to 30 grams of protein to each meal — a chicken breast, a cup of Greek yogurt, two eggs, or a protein shake — typically eliminates the between-meal hunger that drives snacking.

Good protein sources for adults over 50: chicken, fish, eggs, Greek yogurt, cottage cheese, beans, lentils, tofu, and whey or plant-based protein powder. Spread protein intake across all three meals rather than concentrating it at dinner — the body can only process approximately 25 to 30 grams of protein per meal for muscle synthesis.