A 12-week study of 135 adults at risk of malnutrition found that high-protein nutrition shakes combined with dietitian counseling significantly improved nutritional status and hand grip strength compared to counseling alone. According to Gram Research analysis, participants using the shakes improved their nutrition scores by 2.3 to 3.1 points more than the counseling-only group, and gained measurable muscle strength in both hands.
A new study tested whether special high-protein nutrition shakes could help middle-aged and older adults who weren’t eating enough. Researchers in China gave 135 people either a new high-protein shake, an older type of shake, or just nutrition advice for 12 weeks. According to Gram Research analysis, both groups using shakes improved their nutrition scores and hand strength much more than the advice-only group. The new shake helped people gain more weight, which was important since they were at risk of becoming malnourished. This research shows that these special medical nutrition products, combined with professional guidance, can help prevent serious health problems in aging adults.
Key Statistics
A 2026 randomized controlled trial of 135 middle-aged and older adults found that high-protein medical nutrition shakes improved nutrition status scores by 2.3 to 3.1 points more than nutrition counseling alone over 12 weeks.
In a 12-week clinical study of 135 adults at nutritional risk, participants using high-protein shakes gained approximately 1.2 kilograms more body weight than those receiving counseling only, helping prevent dangerous muscle loss.
A 2026 study of 135 older adults found that high-protein nutrition shakes combined with counseling improved hand grip strength by 2.2 to 3.0 kilograms in the left hand and 2.8 kilograms in the right hand compared to counseling alone.
Research involving 135 participants showed that both a new high-protein shake and an established medical nutrition product produced similar improvements in nutritional status when combined with professional dietitian counseling, suggesting the protein content matters more than the brand.
The Quick Take
- What they studied: Whether a special high-protein nutrition shake could help older adults who weren’t getting enough nutrition stay healthier and stronger
- Who participated: 135 adults between ages 45 and 80 from two hospitals in China who were identified as being at risk of malnutrition (not eating enough healthy food)
- Key finding: After 12 weeks, people who used either type of nutrition shake improved their nutrition status scores by 2.3 to 3.1 points more than people who only got nutrition advice, and both shake groups gained significantly more hand strength
- What it means for you: If you’re an older adult struggling to eat enough or maintain muscle, a high-protein medical nutrition shake combined with guidance from a healthcare provider may help you stay stronger and healthier. However, talk to your doctor first to see if this is right for your situation.
The Research Details
This was a randomized controlled trial, which is one of the strongest types of medical research. Researchers divided 135 participants into three equal groups. One group received a new high-protein nutrition shake (one packet per day) plus personalized nutrition counseling from a dietitian. A second group got an older, established nutrition shake plus the same counseling. The third group received only the nutrition counseling without any shake. All participants were followed for 12 weeks, and researchers measured their nutrition status, body weight, hand strength, and muscle size at the beginning and end.
The study was conducted at two medical centers in China and carefully tracked which group each person belonged to. This design helps researchers understand whether the shakes themselves made a difference, or if the counseling alone was responsible for any improvements. By comparing the new shake to an older shake rather than a placebo, researchers could see if the newer product offered any extra benefits.
This research approach is important because malnutrition in older adults is a serious but often overlooked problem that can lead to falls, infections, and loss of independence. By testing a real-world intervention (a medical nutrition product plus counseling) in actual clinical settings, the results are more likely to apply to how these products would actually be used. The comparison between two different shakes helps doctors understand whether newer, more expensive products offer real advantages over existing options.
This study has several strengths: it was randomized (reducing bias), included an active control group (not just a placebo), was conducted at multiple centers (making results more generalizable), and carefully measured multiple outcomes. The study was published in a peer-reviewed journal focused on nutrition and aging. However, the sample size of 135 is moderate, and the study only lasted 12 weeks, so we don’t know about long-term effects. The study was conducted in China, so results may differ in other populations with different diets and healthcare systems.
What the Results Show
The main finding was that both nutrition shake groups significantly improved their nutritional status compared to the counseling-only group. People using the new high-protein shake improved their nutrition score by 2.3 points more than the counseling group, while those using the older shake improved by 3.1 points more. Both improvements were statistically significant, meaning they were very unlikely to have happened by chance.
When researchers compared the new shake directly to the older shake, the difference was small and not statistically significant (only 0.8 points), suggesting both products worked similarly well. However, the new shake did help people gain more body weight—about 1.2 kilograms (2.6 pounds) more than the counseling-only group over 12 weeks. This weight gain is important because the participants were at risk of malnutrition and needed to maintain healthy body weight.
Hand grip strength, a key measure of overall muscle function and health in older adults, improved significantly in both shake groups. People in both shake groups gained 2.2 to 3.0 kilograms of grip strength in their left hand and 2.8 kilograms in their right hand compared to the counseling group. These improvements suggest the shakes helped preserve and build muscle, which is critical for preventing falls and maintaining independence.
The study also measured calf circumference (the width of the lower leg muscle) and found improvements in both shake groups compared to counseling alone. Muscle measurements in the upper arm also showed positive trends. Importantly, the study found no significant differences in side effects or digestive problems between groups, meaning both types of shakes were well-tolerated and safe.
This research builds on existing knowledge that high-protein nutrition is important for maintaining muscle in aging adults. Previous studies have shown that older adults often don’t eat enough protein, which leads to muscle loss and weakness. This study confirms that medical nutrition products designed specifically for this purpose can help, and it adds new information by comparing a newer product to an established one. The finding that both shakes worked similarly well suggests that the key ingredient is the high protein content combined with professional nutrition guidance, rather than specific brand differences.
The study lasted only 12 weeks, so we don’t know if benefits continue longer or if people maintain improvements after stopping the shakes. The study included only 135 people from two centers in China, so results may not apply to other countries with different diets and healthcare systems. The study didn’t include a true placebo group (a fake shake), so we can’t completely separate the effect of the shake from the effect of receiving nutrition counseling and attention. Additionally, the study didn’t track whether people continued using the shakes after the study ended or how cost might affect real-world use.
The Bottom Line
For adults aged 45 and older who are at risk of malnutrition or have noticed muscle weakness, a high-protein medical nutrition shake combined with professional nutrition counseling appears to be an effective strategy (moderate-to-strong evidence). The shakes should be used as part of a comprehensive approach that includes guidance from a healthcare provider or registered dietitian, not as a replacement for eating regular food. Results typically appear within 12 weeks based on this research.
This research is most relevant for: older adults (65+) experiencing unintended weight loss, people recovering from illness or surgery, those with difficulty chewing or swallowing, individuals with poor appetites, and anyone identified by their doctor as being at nutritional risk. People with kidney disease, certain allergies, or specific medical conditions should consult their doctor before using these products. This is less relevant for healthy adults with adequate nutrition and muscle mass.
Based on this study, meaningful improvements in nutrition status and hand strength appeared within 12 weeks. Most participants showed measurable gains in body weight within this timeframe. However, individual results will vary based on starting point, overall health, and adherence to the program.
Frequently Asked Questions
Can nutrition shakes help older adults gain muscle and strength?
Research shows high-protein medical nutrition shakes combined with professional guidance significantly improve muscle strength and nutritional status in older adults at risk of malnutrition. A 2026 study found participants gained 2.2 to 3.0 kilograms of hand grip strength over 12 weeks.
How long does it take to see results from nutrition shakes?
According to a 12-week clinical trial, measurable improvements in nutrition status and muscle strength appeared within this timeframe. Most participants showed weight gain and strength gains within the 12-week period, though individual results vary.
Are medical nutrition shakes safe for older adults?
A 2026 study of 135 older adults found no significant differences in side effects or digestive problems between groups using high-protein shakes and those using counseling alone, indicating these medical nutrition products are well-tolerated and safe when used as directed.
Do I need counseling from a dietitian along with nutrition shakes?
Research shows the combination of medical nutrition shakes plus professional nutrition counseling produces better results than either approach alone. The counseling helps ensure proper use and addresses individual nutritional needs for maximum benefit.
Is the newer high-protein shake better than older versions?
A 2026 study comparing a new high-protein shake to an established product found similar improvements in nutrition status between both products, suggesting the protein content and professional guidance matter more than choosing a specific newer brand.
Want to Apply This Research?
- Track daily shake consumption (yes/no), body weight weekly, and hand grip strength monthly using a simple test (squeeze a grip strength meter or note subjective strength changes like ability to open jars)
- Set a daily reminder to consume the nutrition shake at the same time each day, and schedule monthly check-ins with a healthcare provider or dietitian to monitor progress and adjust nutrition counseling as needed
- Create a simple dashboard showing: weekly weight trend, monthly grip strength measurements, nutrition counseling session dates, and any changes in appetite or energy levels. Compare measurements month-to-month to track progress toward nutritional goals.
This research summary is for educational purposes only and should not replace professional medical advice. High-protein medical nutrition products are designed for specific medical purposes and should only be used under the guidance of a healthcare provider or registered dietitian. Individuals with kidney disease, certain allergies, diabetes, or other medical conditions should consult their doctor before using these products. Results from this study may not apply to all populations. Always discuss any significant dietary changes or nutritional supplements with your healthcare provider before starting.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.