How Much Protein Does an Adult Need, and How Does the Requirement Change With Age?

Protein needs depend on the overall energy content of the diet, age, activity level, health status, and usual food sources. The recommendations provided do not establish a universal amount of protein in grams for every adult, so it is more appropriate to view protein as part of a balanced diet rather than as a separate target for everyone.

What the Evidence Says

U.S. Department of Agriculture and U.S. Department of Health and Human Services define the acceptable protein intake range for adults as 10–35% of daily energy. This is a population-level guideline, not a personalized prescription: it does not account for individual body weight, physical activity, dietary patterns, or medical conditions. Converting this range into a specific amount of protein without additional information about the diet would be inappropriate.

Ministry of Health of Ukraine states that in adults, at least half of all protein consumed should be of animal origin. This guideline concerns the proportion of protein sources, not increasing the total amount of protein. In practice, this means that the diet should be assessed based on food variety and the regularity of meals, not just one indicator.

Overall energy needs change with age. According to Ministry of Health of Ukraine, women aged 60–74 years are given a guideline of 1800 kcal of energy per day, while women aged 75 years and older are given 1600 kcal. For men, the corresponding guidelines are 2000 kcal and 1800 kcal. Since protein is also defined as a proportion of daily energy, a change in energy needs may affect the absolute amount of protein in the diet. This does not mean that protein should automatically be increased or decreased without assessing the diet as a whole.

What This Looks Like in Practice

When planning meals, it is helpful to think not about one “correct” number, but about regularly including protein foods in different meals and aligning them with overall energy needs. For older adults, movement and sufficient dietary variety are also important.

• Distribute protein foods across meals if this makes it easier to maintain a varied diet.
• Combine different protein sources, bearing in mind the guideline from Ministry of Health of Ukraine: at least half of all protein consumed should be of animal origin.
• Do not assess protein needs separately from total energy: for older age groups, Ministry of Health of Ukraine provides different energy guidelines for women and men and for different age categories.
• Remember that carbohydrates and fats are also part of the diet. Ministry of Health of Ukraine gives women aged 60–74 years a guideline of 270 g of carbohydrates and 54 g of fat per day, while women aged 75 years and older are given 240 g of carbohydrates and 44 g of fat.
• For men, Ministry of Health of Ukraine gives a guideline of 300 g of carbohydrates and 60 g of fat per day at ages 60–74 years, and 270 g of carbohydrates and 38 g of fat at ages 75 years and older.
• After age 65, WHO additionally recommends varied balance and strength exercises on 3 or more days per week. This is a general activity guideline, not an individualized program.

What to Consider

Age alone cannot determine an individual’s protein needs. Appetite, usual diet, level of movement, food tolerance, and the presence of conditions requiring an individualized approach to nutrition are also important. The population-level guidelines from USDA, HHS, Ministry of Health of Ukraine, and WHO are not personalized prescriptions.

Individual nutrients also have age-related guidelines. NIH Office of Dietary Supplements states that after age 70, the recommended calcium intake is 1200 mg per day for men and women, while after age 50, the tolerable upper intake level for calcium decreases to 2000 mg per day. According to NHS, for women aged 50 and older, the iron requirement is the same as for men—8,7 mg per day. These data do not determine protein needs, but they show why the diet should be assessed comprehensively.

In Brief

• For adults, USDA and HHS define the acceptable protein range as 10–35% of daily energy.
• Ministry of Health of Ukraine recommends that at least half of all protein consumed by adults be of animal origin.
• Overall energy needs may change with age, so protein should be assessed in the context of the entire diet.
• After age 65, WHO recommends balance and strength exercises on 3 or more days per week.
• All the guidelines provided are population-level and do not replace an individualized dietary assessment.

This is general information about nutrition and habits, not medical advice. If you are pregnant, breastfeeding, taking medication, or have a chronic disease, discuss dietary changes with your doctor.