Ensure and similar oral nutritional supplements can be genuinely helpful for older adults who are malnourished or struggling to eat enough, but they work best as a bridge, not a replacement for real meals. The research on these drinks is most convincing in specific clinical scenarios: recovering from a hospital stay, healing from a fracture, or managing unintentional weight loss. For a generally healthy older person who eats reasonably well, a daily Ensure is unlikely to provide meaningful benefit and may just add sugar and calories to an already adequate diet. The details matter quite a bit, so the honest answer depends on who is drinking it and why.
Where the Evidence Is Strongest
Most of the research on liquid nutritional supplements in older adults focuses on people who are already malnourished or losing weight involuntarily. In those populations, the evidence is fairly clear. A meta-analysis of randomized controlled trials in older adults with poor appetite found that oral nutritional supplements increased overall energy and protein intake and led to meaningful gains in body weight and BMI.1MDPI (Nutrients). Effectiveness of Oral Nutritional Supplements on Older People with Anorexia: A Systematic Review and Meta-Analysis of Randomized Controlled Trials – Section: 3. Result Appetite loss in older adults is common, affecting roughly one in four to one in three people depending on the setting, and it tends to be worse among those in hospitals or nursing homes. For someone in that situation, a supplement drink genuinely adds calories and nutrients on top of whatever food they manage to eat.
A study of nursing home residents given a liquid nutritional supplement found significant improvements not just in weight but also in blood levels of several vitamins, including B1, B6, B12, folate, and vitamin D, compared to a placebo group.2European Journal of Clinical Nutrition. Study of the effect of a liquid nutrition supplement on the nutritional status of psycho-geriatric nursing home patients That matters because many older adults have subclinical deficiencies in these micronutrients, and correcting them through food alone can be difficult when someone simply doesn’t eat much.
Muscle Loss and Physical Function
One of the biggest concerns in aging is sarcopenia, the gradual loss of muscle mass and strength that accelerates after about age 65. This is where nutritional supplements have drawn a lot of research attention, because muscle depends on adequate protein intake, and many older adults fall short of what their bodies need. Current evidence suggests older people benefit from around 1.2 grams of protein per kilogram of body weight each day or more, yet many consume well below that threshold.3PubMed Central. Rational Use of Protein Supplements in the Elderly-Relevance of Gastrointestinal Mechanisms
A randomized trial called the PROVIDE study tested a supplement enriched with whey protein, leucine, and vitamin D in older adults with sarcopenia. After 13 weeks, those receiving the supplement gained more appendicular muscle mass and improved their ability to stand from a chair compared to a placebo group.4Journal of the American Medical Directors Association. Effects of a Vitamin D and Leucine-Enriched Whey Protein Nutritional Supplement on Measures of Sarcopenia in Older Adults, the PROVIDE Study: A Randomized, Double-Blind, Placebo-Controlled Trial The researchers noted this was particularly relevant for people unable to exercise, suggesting the supplement alone moved the needle on muscle health.
When supplements are paired with exercise, the results tend to be more pronounced. A study combining oral nutritional supplementation with a physical exercise program in older adults at risk for sarcopenia found substantial improvements after 12 weeks: calf circumference increased, handgrip strength improved by about 5 kilograms on average, lean body mass went up, and the time it took to complete a timed physical test dropped meaningfully.5PubMed Central. Effects of an Oral Nutritional Supplementation and Physical Exercise Intervention on Older Adults at Risk for Sarcopenia – Section: Results The combination matters. If your parent or grandparent can do even light resistance exercise alongside a supplement, the benefits compound.
What Happens After a Hospital Stay
Malnutrition is strikingly common in hospitalized older adults, and it tends to get worse during the stay itself because of poor appetite, nausea, fasting for procedures, and general illness. This is a scenario where supplement drinks have been tested most rigorously. A large randomized trial of malnourished older hospital patients given a high-protein supplement enriched with HMB (a compound that helps protect muscle) found that 90-day mortality was cut roughly in half compared to placebo, dropping from about 10% to about 5%.6PubMed. Readmission and mortality in malnourished, older, hospitalized adults treated with a specialized oral nutritional supplement: A randomized clinical trial That’s a striking result, though it was a secondary outcome and the primary composite endpoint didn’t reach significance.
A separate study at a US academic medical center found that malnourished patients who used oral nutritional supplements had about 39% fewer 30-day hospital readmissions compared to similar patients who did not receive them.7Journal of the Academy of Nutrition and Dietetics. The Association between Oral Nutritional Supplements and 30-Day Hospital Readmissions of Malnourished Patients at a US Academic Medical Center However, the picture isn’t universally positive. A systematic review looking specifically at older patients after hospital discharge found no significant effect of oral supplements on mortality or readmission rates across pooled trial data.8PubMed. Oral nutritional support of older (65 years+) medical and surgical patients after discharge from hospital: systematic review and meta-analysis of randomized controlled trials The discrepancy likely reflects differences in how sick and how malnourished the patients were. The sicker and more depleted you are, the more a supplement seems to help.
Hip Fractures and Wound Healing
Older adults who break a hip face a cascade of problems: immobility, rapid muscle loss, slow healing, and high risk of complications. Nutritional supplements have shown real value here. A multi-center trial of hip fracture patients found that those receiving supplements maintained their muscle mass and BMI during recovery, while the control group saw both decline.9Maturitas. Effectiveness of nutritional supplementation on sarcopenia and recovery in hip fracture patients. A multi-centre randomized trial In a population where losing muscle during recovery can mean permanently losing independence, preventing that decline is a concrete, practical win.
Wound healing is another area where the right supplement formulation makes a measurable difference. In long-term care residents with pressure ulcers, nine weeks of a specialized oral nutritional supplement reduced average wound area by about 53%, with one in five ulcers achieving complete closure.10PubMed. Benefits of an oral nutritional supplement on pressure ulcer healing in long-term care residents A randomized trial testing a formula enriched with arginine, zinc, and antioxidants found it outperformed a standard control supplement for healing pressure ulcers, with roughly 61% wound area reduction versus 45% in the control group over eight weeks.11PubMed. A nutritional formula enriched with arginine, zinc, and antioxidants for the healing of pressure ulcers: a randomized trial The body needs extra protein and certain micronutrients to repair tissue, and when someone is already eating poorly, a supplement can supply what their meals cannot.
Supplements and Dementia
People with dementia are at particularly high risk of malnutrition. They may forget to eat, lose interest in food, struggle with utensils, or have difficulty swallowing. Nutritional supplement drinks have been tested in this population, and while no one expects them to reverse cognitive decline, they can help maintain weight and nutritional status. A meta-analysis of studies in dementia patients found significant improvements in weight and BMI, and, interestingly, a modest improvement in cognition scores at follow-up of roughly six to seven months.12Clinical Nutrition. Use of nutritional complete supplements in older adults with dementia: Systematic review and meta-analysis of clinical outcomes
A smaller study focused on whether supplement drinks displaced regular meals in dementia patients. It found they did not; instead, the supplements added calories on top of what participants ate, helping more of them meet their nutritional requirements.13PubMed Central. The influence of nutritional supplement drinks on providing adequate calorie and protein intake in older adults with dementia A systematic review of liquid nutritional supplements for dementia patients in residential care found some evidence supporting weight gain, though it emphasized the need for more research.14JBI Evidence Synthesis. Oral liquid nutritional supplements for people with dementia in residential aged care facilities: a systematic review For caregivers managing someone with moderate to severe dementia, a supplement drink can be one of the simpler tools to help prevent dangerous weight loss when regular eating becomes increasingly difficult.
The Taste Fatigue Problem
Here’s something the marketing won’t tell you: many older adults find these drinks hard to keep consuming day after day. Research on adherence reveals that in one study of patients recovering from fractures, the median daily consumption was only about 67% of the prescribed volume.15Nutrition in Clinical Practice / SAGE Journals. Adherence to nutrition supplements among patients with a fall-related lower limb fracture About 29% of participants were classified as “refusers” who frequently skipped doses, and those refusers lost significantly more body weight over six weeks than the people who drank the supplements consistently.
A literature review exploring why people stop drinking their supplements identified several recurring complaints: unpleasant aftertastes caused by the nutritional ingredients themselves, a thick mouthcoating that builds up during drinking, abdominal bloating, and altered flavor perception caused by medications or by wearing dentures.16PubMed Central. Factors Affecting Adherence, Intake, and Perceived Palatability of Oral Nutritional Supplements: A Literature Review Perhaps the most practical finding: using a single flavor repeatedly causes taste fatigue and declining intake over time.17Journal of Nutritional Science. A randomised controlled crossover study to assess adherence and palatability of a porridge supplement compared to a drink-based supplement in hospitalised older adults at risk of malnutrition Rotating flavors, serving the drinks chilled, offering them between meals rather than alongside them, and trying different formats (some companies offer pudding-style or powdered options) can all help. If your relative grimaces every time you hand them a bottle, the supplement isn’t working, because a drink left unfinished has zero nutritional value.
Specialized Formulas Versus Standard Ensure
Not all supplement drinks are the same, and this is a common point of confusion. Standard Ensure Original contains about 220 calories and 9 grams of protein per 8-ounce serving. Ensure Plus bumps that to 350 calories and 16 grams of protein. Ensure High Protein delivers 16 grams of protein with fewer calories. Competitors like Boost, Kate Farms, and store brands offer comparable ranges. The formulation differences can matter clinically.
Several of the positive trial results described above used supplements specifically enriched with ingredients like HMB (beta-hydroxy-beta-methylbutyrate), leucine, arginine, zinc, or higher protein loads. A review of studies on HMB-enriched high-protein supplements concluded that these specialized formulas show promise for maintaining muscle mass and function, particularly during hospital rehabilitation.18PubMed Central. Role of Oral Nutritional Supplements Enriched with β-Hydroxy-β-Methylbutyrate in Maintaining Muscle Function and Improving Clinical Outcomes in Various Clinical Settings A standard Ensure from the grocery store may not replicate the results of a trial that used a specialized clinical formula. If a doctor or dietitian recommends a supplement for muscle loss or wound healing, it’s worth asking which specific product and formulation they have in mind.
Kidney Health Concerns
A common worry, especially among families of very old adults, is whether the extra protein in these drinks could harm the kidneys. For someone with healthy kidneys, the protein levels in standard supplement drinks are not considered dangerous. However, for people with chronic kidney disease, the situation is more complicated. A systematic review evaluating nutritional supplements in people with kidney disease found that the evidence for benefit was low to very low quality, and the review recommended that people with kidney disease consult their physician before using any nutritional supplement.19MDPI (Nutrients). Systematic Review of Nutrition Supplements in Chronic Kidney Diseases: A GRADE Approach – Section: 4.1. Findings and Implications of this Systematic Review High-protein formulas in particular can increase the workload on kidneys that are already struggling. If your family member has been told their kidney function is reduced, this is a conversation for their doctor, not something to start on your own.
A Hidden Hygiene Issue
Here is something most people never think about: dairy-based oral nutritional supplements can become breeding grounds for bacteria and yeast if they sit at room temperature. A laboratory study found that common pathogens, including E. coli, Staphylococcus aureus, and Candida albicans, proliferated in dairy-based supplements left at room temperature. Candida also grew in juice-style supplements. Bacteria were recovered from partially consumed containers as well.20PubMed. Thickened Drinks and Oral Nutritional Supplements as Potential Reservoirs of Oral Microorganisms: Microbial Assays In Vitro This is particularly relevant for frail older adults who sip their drinks slowly over an hour or two, or for people with dementia who may set a partially consumed bottle aside and return to it much later. Once opened, these drinks should be refrigerated and consumed within a few hours, not left on a bedside table all day.
What They Cost and Whether That’s Worth It
At retail, a case of Ensure typically runs between $1.50 and $2.50 per bottle depending on the formulation and where you shop. For someone drinking one or two a day, that adds up to $45 to $150 per month. Medicare generally does not cover oral nutritional supplements unless they are administered through a feeding tube, which leaves most older adults paying out of pocket.
From a health-economics perspective, though, the cost calculation looks different when you factor in what malnutrition leads to: longer hospital stays, readmissions, pressure ulcers, falls, and loss of independence. A cost-effectiveness analysis of a specialized supplement used during hospitalization estimated that the cost per life-year gained was remarkably low when projected over a lifetime horizon, driven largely by the survival benefit seen in malnourished hospitalized patients.21PubMed Central. The Cost-Effectiveness of Oral Nutrition Supplementation for Malnourished Older Hospital Patients A separate UK study in care home residents found that supplements cost more than dietary advice alone but generated enough quality-of-life improvement to be considered cost-effective by standard thresholds, with over 80% probability of falling within acceptable cost-per-quality-adjusted-life-year ratios.22Clinical Nutrition. Cost-effectiveness of oral nutritional supplements in older malnourished care home residents A broader systematic review found at least some evidence supporting cost-effectiveness in care-home settings.23PubMed. Effectiveness and cost-effectiveness of oral nutritional supplements in frail older people who are malnourished or at risk of malnutrition: a systematic review and meta-analysis
When Whole Food Is the Better Choice
If your older relative eats three meals a day and maintains a stable weight, a supplement drink is largely unnecessary. The sugar content in many standard formulas is not trivial. Ensure Original contains about 15 grams of added sugar per serving, and for someone managing diabetes or prediabetes, that can create blood sugar spikes that outweigh any nutritional benefit. Whole foods also provide fiber, phytonutrients, and the sensory pleasure of eating, which matters for quality of life and for maintaining the mechanical act of chewing and swallowing.
The best use case for Ensure and its competitors is as a safety net: something that fills a gap when appetite is low, meals are being skipped, or recovery from illness or surgery demands extra calories and protein. Protein intake, as noted earlier, is best spread across the day in doses of about 30 grams per sitting rather than consumed all at once.3PubMed Central. Rational Use of Protein Supplements in the Elderly-Relevance of Gastrointestinal Mechanisms A supplement between breakfast and lunch, or as a late-afternoon snack, can help an older person reach a protein target they are missing at meals without displacing the food they are still eating.
For families wondering whether to start a loved one on supplement drinks, a practical starting point is tracking what the person actually eats over a few days. If meals are consistently small or being skipped, and weight is trending down, a supplement drink makes sense as part of the response. If the issue is more about dietary quality than quantity, improving the meals themselves is a better first step. And if there are underlying medical conditions like kidney disease, diabetes, or swallowing difficulties, the right formulation and the right timing should be discussed with a healthcare provider rather than guessed at from the grocery store shelf.