Which Ensure Is Good for Diabetics?

Diabetes-specific nutritional shakes made by Abbott, the same company behind the Ensure line, are sold under the Glucerna brand rather than the Ensure name in most markets. Standard Ensure products are designed for general nutrition and contain carbohydrate blends that can spike blood sugar more than formulas tailored for diabetes. The distinction matters because a systematic review and meta-analysis found that diabetes-specific formulas reduced the post-meal rise in blood glucose by about 1 mmol/L and cut the overall glucose response by roughly 35% compared with standard nutritional formulas.¹ Understanding what separates a diabetes-friendly formula from a standard one helps you pick the right product, whether it carries the Glucerna label or a competitor’s name.

What Makes a Nutritional Formula “Diabetes-Specific”

Not every meal-replacement shake is built the same way, and the differences go well beyond marketing. Diabetes-specific nutritional formulas typically differ from standard shakes in three key ways: the type and amount of carbohydrate, the proportion of protein, and the inclusion of certain fibers and fats designed to slow digestion. Standard Ensure, for example, uses maltodextrin and sugar as primary carbohydrate sources, which digest quickly and produce a sharp glucose spike. Diabetes-specific versions swap in slow-release carbohydrates like modified maltodextrin, isomaltulose, or resistant starch, and they often add soluble fiber to further blunt the glucose curve.

The protein content tends to be higher, too. While a standard Ensure might deliver around 9 grams of protein per serving, diabetes-specific formulas commonly provide 15 to 30 grams. That extra protein serves double duty: it supports muscle maintenance and contributes to a slower, flatter blood sugar response after drinking the shake. Some formulas also include monounsaturated fats from sources like high-oleic sunflower oil, which replace a portion of the carbohydrate calories and further reduce the glycemic load.

How Much Difference the Right Formula Actually Makes

The gap in blood sugar response between a standard shake and a diabetes-specific one is not subtle. In a crossover trial comparing a high-protein diabetes-specific shake with an equal-calorie serving of instant oatmeal in people with type 2 diabetes, the diabetes-specific shake produced roughly an 80% reduction in the post-meal glucose response over four hours, and the peak glucose rise was about 57% lower.² Those numbers are striking, though the comparison was against oatmeal rather than a standard Ensure shake. Still, the broad pattern holds across studies: diabetes-specific formulas consistently outperform standard nutritional products on glycemic measures.

A 12-week trial in people with type 2 diabetes found that using a diabetes-specific oral nutritional supplement led to significantly lower post-meal peak glucose at both the 6-week and 12-week marks, and HbA1c also dropped more than in the control group.³ HbA1c reflects average blood sugar over about three months, so a measurable drop there suggests the benefit goes beyond individual meals and accumulates over time. That said, not every trial has seen improvements in fasting glucose or lipid markers, so the most reliable advantage of these formulas appears to be in taming the post-meal spike specifically.⁴

The benefits also extend to tube-fed patients in hospital settings. A systematic review and meta-analysis of diabetes-specific tube-feeding formulas found statistically significant improvements in glycemic control in both critically ill and long-term care populations, though the researchers cautioned that small effect sizes and variability between studies made the overall certainty moderate.⁵ For everyday consumers choosing between products on a pharmacy shelf, the takeaway is simpler: the diabetes-specific version genuinely performs differently from the standard one.

Why Higher Protein Content Matters

You might wonder whether protein content alone could explain most of the benefit. It does play a large role. Protein slows gastric emptying, meaning the stomach takes longer to pass its contents into the small intestine. That slower transit spreads carbohydrate absorption across a wider time window, reducing the sharp rise in blood sugar that follows a fast-digesting meal. Protein also stimulates the release of gut hormones like GLP-1, which in turn prompts the pancreas to release insulin in a more gradual, physiologically appropriate way.

A crossover trial in people with prediabetes compared a high-protein diabetes-specific formula against a standard nutritional supplement and found the diabetes-specific product reduced the post-meal glucose response by about 73%, without causing an increase in insulin secretion.⁶ That last detail is worth pausing on. High-protein formulas seem to improve glucose control partly by making existing insulin work more efficiently, rather than forcing the body to pump out more of it. For someone whose pancreas is already under strain from insulin resistance, that distinction is meaningful.

High-protein formulas are also relevant for older adults with diabetes, who face a dual challenge of managing blood sugar while preserving muscle mass. Age-related muscle loss accelerates when protein intake is inadequate, and diabetes itself is associated with faster muscle decline. A shake that delivers 20 or more grams of protein per serving addresses both problems at once.

Slow-Release Carbohydrates and Fiber

The carbohydrate source in a diabetes-specific formula is arguably the single most important label detail to check. Modified maltodextrins and isomaltulose are common in these products because they break down more slowly than ordinary maltodextrin or sucrose. In a study of people with type 1 diabetes who are prone to hypoglycemia between meals, a formula using slow-release carbohydrates reduced both the number and the depth of low blood sugar episodes during continuous glucose monitoring.⁷ That finding is relevant for anyone on insulin or sulfonylureas who uses a nutritional shake as a snack or partial meal, because a formula that keeps blood sugar more stable between meals can reduce the risk of dangerous lows as well as highs.

Soluble fiber, which is added to many diabetes-specific shakes, contributes its own glycemic benefit. It forms a gel-like substance in the gut that slows the absorption of glucose, and it also serves as fuel for beneficial gut bacteria, which produce short-chain fatty acids that further stimulate the release of hormones involved in blood sugar regulation.⁸ When reading labels, look for ingredients like fructooligosaccharides (FOS), inulin, or oat fiber. Even a few grams of soluble fiber per serving adds to the overall glucose-flattening effect.

Using Shakes for Partial Meal Replacement and Weight Control

Many people with type 2 diabetes are also trying to lose weight, and structured meal replacement is one approach that has a reasonable track record. A randomized controlled trial testing diabetes-specific partial meal replacement found that participants in the meal-replacement group saw significant improvements in fasting glucose, insulin levels, and body measurements compared with those following standard dietary advice alone.⁹ Partial meal replacement means swapping one or two meals a day for a shake while eating a balanced meal for the rest, rather than replacing all food with liquid nutrition.

The practical appeal is obvious: a pre-portioned shake removes guesswork about carbohydrate counting and calorie content for at least one meal. That can be especially helpful for people who struggle with dietary adherence or who find meal planning overwhelming. The calorie control built into the shake tends to produce a modest calorie deficit over time, which in turn supports gradual weight loss. However, these products work best when they replace a meal that would otherwise be higher in calories and refined carbohydrates. Drinking a shake on top of your regular meals just adds calories.

What About the Artificial Sweeteners in These Products

Diabetes-specific shakes taste sweet despite having less sugar, and that sweetness usually comes from artificial or non-nutritive sweeteners like sucralose, acesulfame potassium, or stevia. If you have heard conflicting things about whether artificial sweeteners are safe for people with diabetes, you are not alone. The evidence is generally reassuring for blood sugar control specifically: these compounds mimic sweetness without causing the glucose spike that sugar does.¹⁰

A study of aspartame in adults with type 2 diabetes did find a small, transient rise in insulin and triglycerides shortly after consumption, but the values stabilized quickly and the researchers concluded there was no reason to believe that moderate consumption would cause lasting metabolic harm. They noted that the insulin resistance sometimes linked to artificial sweeteners in population studies likely reflects the overall dietary pattern of people who consume heavily processed foods, rather than the sweeteners themselves.¹¹ In short, the artificial sweeteners in a diabetes shake are there to make the product palatable without adding sugar, and the evidence supports that they achieve that goal without undermining glycemic control.

Kidney Concerns With High-Protein Formulas

If you have diabetic kidney disease or have been told your kidney function is declining, the higher protein content in diabetes-specific shakes deserves a conversation with your doctor. Protein metabolism generates waste products that the kidneys must filter, and there is long-standing evidence that reducing protein intake lowers the filtration burden on compromised kidneys. One study in young people with type 1 diabetes found that a lower-protein diet reduced glomerular filtration rate, with the largest effect seen in those whose kidneys were already working in overdrive, a condition called hyperfiltration.¹²

This does not mean high-protein shakes are dangerous for everyone with diabetes. For people with normal kidney function, there is no strong evidence that moderate increases in protein intake cause kidney damage. The concern is specific to those who already have reduced kidney function or who show early signs of diabetic nephropathy, such as protein in their urine. If your doctor has mentioned kidney disease staging or has asked you to limit protein, choose a lower-protein formula or use smaller portions and discuss the options with a dietitian.

Chromium, Magnesium, and Micronutrient Fortification

Many diabetes-specific shakes are fortified with vitamins and minerals, and two in particular get attention in the diabetes literature: chromium and magnesium. Both are involved in insulin signaling, and people with diabetes are somewhat more likely to have low levels of either. A trial testing combined chromium and magnesium supplementation found that the combination significantly reduced fasting blood sugar, fasting insulin, and a measure of insulin resistance, while neither mineral alone produced the same effect.¹³ A separate trial in people with impaired glucose tolerance reached a similar conclusion, with the combination group showing improvements in fasting glucose, post-meal glucose, and HDL cholesterol that did not appear in the single-mineral groups.¹⁴

Before you start stacking supplements, though, it is worth noting that the broader evidence base for chromium and magnesium supplementation in diabetes has not reached a strong consensus. A review of complementary therapies concluded that there is insufficient clinical evidence to recommend routine micronutrient supplementation for type 2 diabetes, and that correcting dietary deficiencies through better food choices is generally more effective than taking supplements.¹⁵ The amounts of chromium and magnesium in a fortified shake are typically modest and unlikely to cause harm, but they are also unlikely to be the main reason your blood sugar improves. Think of them as a minor bonus, not a selling point.

Reading the Label Like a Person With Diabetes

When you are standing in a pharmacy aisle comparing bottles, the most useful numbers to check are these:

Total carbohydrates: Diabetes-specific formulas generally contain fewer total carbohydrates per serving than standard ones. Look for products with roughly 25 grams or less per serving, though some high-protein versions go even lower.
Sugars and sugar alcohols: Some products list sugar alcohols separately. These contribute fewer carbs than regular sugar, but they still have some glycemic impact and can cause digestive discomfort in larger amounts.
Fiber: At least 3 grams of fiber per serving is a good sign. Soluble fiber specifically is what slows glucose absorption.
Protein: Look for 15 grams or more per serving if you do not have kidney restrictions. Higher protein generally means a flatter blood sugar curve.
Fat source: Monounsaturated fat from sources like high-oleic sunflower oil is preferred over saturated fat. Some formulas list the fat breakdown, which is helpful.

The ingredient list matters too. If maltodextrin or corn syrup solids appear as the first or second ingredient, the product is likely to behave more like a standard formula regardless of what the front label says. Diabetes-specific formulas typically list their protein source (milk protein concentrate, casein, or soy protein isolate) and a slow-digesting carbohydrate source near the top.

When a Diabetes Shake Is Not the Right Choice

These products fill a specific role: supplemental or replacement nutrition for people who need a convenient, portion-controlled option that does not wreck their blood sugar. They are not a substitute for a well-rounded diet built on whole foods. Relying on shakes for the majority of your calories long term means missing out on the variety of phytonutrients, the chewing and satiety signals, and the dietary fiber that come with eating actual meals. Most clinical trials use these products as partial meal replacements for one or two daily meals at most, with regular food making up the rest.

They are also not free of calories. A single serving of a diabetes-specific shake typically provides 200 to 350 calories. If you are drinking one as a between-meal snack rather than as a meal replacement, those calories add up and could work against weight-loss goals. Timing and context matter: a shake replacing a fast-food breakfast is a metabolic upgrade, while a shake added on top of your usual three meals is just extra fuel your body may not need.

People on certain medications should also pay attention to the vitamin K content in fortified shakes, since vitamin K can interfere with blood thinners like warfarin. And anyone on insulin should work with their care team to adjust doses when adding a regular shake to their routine, because the more predictable carbohydrate load can change how much insulin is needed at that meal.

Products Beyond the Abbott Family

Because the question often begins with Ensure, it is easy to assume Abbott is the only company making these products. Several other brands produce diabetes-specific formulas with similar ingredient strategies. Nestlé Health Science makes Boost Glucose Control, which uses a blend of slow-digesting carbohydrates and higher protein. Glucerna itself comes in several varieties, including a high-protein version and a hunger-smart version with added fiber. Store brands from major pharmacies increasingly offer their own diabetes-specific shakes that mimic the macronutrient profiles of name-brand products at a lower cost.

The meta-analysis evidence on diabetes-specific formulas generally does not distinguish between brands. The benefits come from the macronutrient architecture of the product, not from a proprietary ingredient unique to one company.¹ That means a less expensive product with a comparable macronutrient breakdown can perform similarly to a premium brand. Compare the nutrition facts panels side by side and focus on total carbohydrates, fiber, protein, and the carbohydrate source in the ingredient list. If those match up, you are paying for packaging differences, not metabolic ones.