Written by the Spacemilk team · Last updated October 2026

Older adults generally need more protein than younger adults, not less. Expert groups recommend at least 1.0 to 1.2 g of protein per kilogram of body weight per day for healthy people over 65, spread across meals and paired with regular strength training. Your doctor or a registered dietitian should set your own number. When choosing a protein powder for seniors, look for a complete protein that mixes easily in small amounts, is low in sugar, and is independently tested.

Why do protein needs change as you age?

Muscle responds to protein a little less with each decade. Researchers call this anabolic resistance: the same meal produces a smaller muscle-building response in an older body than in a younger one. The PROT-AGE study group, convened by the European Union Geriatric Medicine Society, lists "declining anabolic responses to ingested protein" among the reasons older people need more protein than younger adults, along with the extra demands of illness and recovery (Bauer et al., 2013, Journal of the American Medical Directors Association).

At the same time, muscle mass and strength tend to decline with age. When the loss of strength and muscle becomes significant, doctors call it sarcopenia. The European Working Group on Sarcopenia in Older People defines it as a muscle disease, puts low muscle strength at the center of the diagnosis, and notes it is common in older age but can begin earlier in life (Cruz-Jentoft et al., 2019, Age and Ageing). It's identified by a clinician using strength and muscle measurements, so if you're concerned, start with your doctor.

How much protein do older adults need?

The general recommended dietary allowance for adults is 0.8 g per kilogram of body weight per day. Two expert groups recommend more for older people:

Who	PROT-AGE (2013)	ESPEN expert group (2014)
Healthy older adults	At least 1.0–1.2 g/kg/day (people over 65)	At least 1.0–1.2 g/kg/day
Active or exercising	1.2 g/kg/day or more	Daily activity recommended for all
Acute or chronic illness	1.2–1.5 g/kg/day for most	1.2–1.5 g/kg/day if malnourished or at risk; more with severe illness or injury
Severe kidney disease, not on dialysis	An exception: may need to limit protein	—

Sources: Bauer et al., 2013; Deutz et al., 2014, Clinical Nutrition.

For a sense of scale, 1.0–1.2 g/kg works out to roughly 68–82g of protein a day for someone who weighs 150 pounds (68 kg). That's a reference point, not a prescription. Kidney function, medications and other conditions change the right number, so ask your doctor or a registered dietitian before raising your protein intake.

Does it matter when you eat your protein?

Many people eat most of their protein at dinner. PROT-AGE notes that the amount of protein needed to switch on muscle building at a single meal appears to be higher in older adults: about 25 to 30g of protein per meal, containing roughly 2.5 to 2.8g of leucine (Bauer et al., 2013). The same group is candid that evidence on timing was not yet strong enough for firm recommendations, so treat this as a sensible pattern rather than a rule.

Leucine is an essential amino acid that acts as a signal for muscle protein building. Animal proteins like whey, eggs and meat tend to be rich in it. A practical approach is to aim for a solid serving of protein at each meal, especially breakfast, instead of saving most of it for dinner.

Why strength training matters as much as protein

The ESPEN expert group recommends that all older people do daily physical activity or exercise, including resistance and aerobic training, "for as long as possible," and considers protein combined with exercise optimal for maintaining muscle function (Deutz et al., 2014). The CDC recommends that adults 65 and older get at least 150 minutes of moderate activity a week, at least two days of muscle-strengthening activity, and activities that improve balance (CDC). Bands, light weights and chair stands all count. Check with your doctor before starting a new program.

Practical ways to get more protein

• Start with breakfast. Add eggs, Greek yogurt, cottage cheese or a protein shake to the meal that's often lowest in protein.
• Go small and often if your appetite is low. Smaller meals and snacks with protein can be easier than large plates.
• Choose soft, easy-to-chew foods if chewing is hard. Eggs, fish, yogurt, beans, tofu and soups are gentler than tough meats. A protein drink you can sip takes no chewing at all.
• Stir protein into foods you already eat. An unflavored powder can go into oatmeal, mashed potatoes, soups or smoothies without adding much volume.

What to look for in a protein powder for older adults

• Complete protein. All nine essential amino acids, ideally with a PDCAAS (protein quality score) of 1.0.
• Leucine. Check the amino acid profile if it's published. Whey is among the richest sources.
• Protein per serving. Around 20g or more makes a meaningful contribution to a meal.
• Low sugar. Look for 0g or very little added sugar.
• What's left out. Lactose, sugar alcohols and heavy gums bother some stomachs.
• Third-party testing. Look for brands that publish heavy metal and contaminant results, not just a seal.
• Easy mixing. A powder that dissolves in a modest amount of liquid is easier to finish.

For a closer look at how two complete proteins compare, read Yeast protein vs whey.

What does the research on yeast protein in older adults show?

Yeast protein, the protein in Spacemilk, was studied in a 6-month randomized trial of 92 community-dwelling adults in China, average age 73, who had low muscle mass at the start (Bai et al., 2026, Food Science & Nutrition, 14(3), e71552). Participants took 20g a day of yeast protein powder or whey protein powder, or no supplement, for 24 weeks, while keeping their usual diet and activity.

• Physical performance: the yeast protein group's Short Physical Performance Battery (SPPB) score, a 12-point test of balance, walking and rising from a chair, rose by 0.9 points. The whey group rose 0.3 points and the no-supplement group fell 1.7 points (between-group p=0.002).
• Walking speed: up 0.2 m/s with yeast protein and 0.1 m/s with whey, and down 0.1 m/s without a supplement (between-group p=0.003).
• Muscle mass and grip strength: no significant differences between groups. The measured changes were in physical function, not muscle size or strength.

Some limits worth knowing. The control group received no supplement, not a placebo, and participants knew whether they were drinking a protein powder, although the people taking measurements did not. Yeast protein and whey produced comparable effects; the study doesn't show one beat the other. It was a single, small study in one population, and it tested yeast protein as an ingredient rather than Spacemilk as a finished product.

Separately, yeast protein, the protein in Spacemilk, was shown in a 2024 double-blind randomized controlled trial to match whey for building lean muscle and strength in men over 40 doing resistance training (Briskey et al., 2024, Journal of Food and Nutrition Research, 12(5), 292–300). Both studies are summarized on our Science page.

Where does Spacemilk fit?

Spacemilk is a protein powder, not a treatment for any condition. Here's what's in it:

• 20g of complete protein per serving (PDCAAS 1.0), isolated from non-GMO baker's yeast. What is yeast protein?
• About 1.8g of leucine per 20g of protein, so it pairs well with eggs, yogurt or another protein food at breakfast
• 0g sugar, sweetened with Reb M (a sweetener fermented from rice) and thaumatin in the flavored versions
• No lactose, no sugar alcohols and no gums like xanthan or guar; a small amount of konjac fiber gives the flavored versions their body
• Formulated to be low in FODMAPs (not certified)
• Free from all nine major allergens: dairy, soy, gluten, eggs, tree nuts, peanuts, fish, shellfish and sesame
• Every batch third-party tested, with results on our testing page

It stirs into water, milk, coffee or oatmeal with a spoon. If you want an easy way to add protein to breakfast, Spacemilk Complete Protein is one option.

Who should check with a doctor

• You have kidney disease or reduced kidney function, or have been told to limit protein.
• You take several medications, or any that require a specific diet.
• You have trouble swallowing. Your care team may want liquids thickened to a particular consistency.
• You've lost weight without trying, or your appetite has dropped noticeably.
• You've had a fall, feel weaker than usual, or are planning to start a new exercise program.
• You have a food allergy, including a known yeast allergy.

This page shares nutrition facts and published guidance, not medical advice.

Frequently asked questions

How much protein do older adults need per day?

Expert groups recommend at least 1.0 to 1.2 g per kilogram of body weight per day for healthy older adults, and 1.2 to 1.5 g/kg for most people with acute or chronic illness. People with severe kidney disease may need less. Ask your doctor or dietitian for your number.

Which protein powder is right for seniors?

No single powder suits everyone. Look for a complete protein with about 20g per serving, little or no sugar, a short ingredient list, published third-party testing, and a texture you'll actually drink.

Can protein powder reverse muscle loss with age?

No food can promise that. Adequate protein and regular strength training together are what expert groups recommend for maintaining muscle function. If you're worried about muscle loss, talk to your doctor.

Is yeast protein suitable for older adults?

Yeast protein has been studied in adults averaging 73 years old, as described above. It's a complete protein with no dairy or lactose. Check with your doctor first if you have a yeast allergy or a condition that affects how much protein you should eat.

Where can I find more answers?

See our FAQ.