Plant-based proteins like beans, lentils, and tofu are generally the best choices for people with diabetes because they improve insulin sensitivity, while animal proteins tend to work against it. But the full picture is more nuanced. Some animal proteins, particularly whey and fatty fish, offer specific benefits for blood sugar control and heart health. The ideal approach for most people with diabetes is a mix of protein sources, with plant foods forming the foundation.
Most nutrition guidelines suggest people with type 2 diabetes aim for 20 to 30 percent of their total daily calories from protein. That translates to roughly 100 to 150 grams of protein food at each meal, depending on your calorie needs. The source of that protein matters as much as the amount.
Why Plant Protein Has the Edge
The source of your dietary protein directly shapes how well your body responds to insulin. Animal protein stimulates glucagon secretion, a hormone that raises blood sugar and amplifies insulin resistance. Plant protein does the opposite: it enhances insulin sensitivity, meaning your cells respond more efficiently to the insulin your body produces. For someone with type 2 diabetes, where insulin resistance is the core problem, this distinction is significant.
Studies using precise lab measurements of insulin sensitivity have shown that plant-based diets improve multiple components of metabolic syndrome at once, including blood pressure, cholesterol, weight, and blood sugar control. People on plant-based regimens also tend to need less insulin overall. The practical takeaway: replacing even some animal protein with plant protein can meaningfully improve how your body handles glucose.
The best plant protein sources for diabetes include lentils, chickpeas, black beans, edamame, tofu, and tempeh. These foods combine protein with fiber, which further slows the absorption of sugar into your bloodstream. A cup of cooked lentils, for example, provides about 18 grams of protein alongside 15 grams of fiber. Nuts and seeds (almonds, walnuts, chia seeds, hemp hearts) add healthy fats along with their protein, supporting heart health without spiking blood sugar.
Whey Protein Lowers Blood Sugar Spikes
Whey protein, derived from milk, stands out among animal proteins for one specific reason: consuming it before a meal significantly reduces the blood sugar spike that follows. A systematic review and meta-analysis found that a whey protein “premeal” lowered peak glucose concentration by 1.4 mmol/L compared to water, with high certainty. The effect was more pronounced and lasted longer in people with type 2 diabetes than in people without it.
The mechanism involves multiple pathways working together. Whey triggers the release of GLP-1, the same gut hormone targeted by popular diabetes medications. It also stimulates insulin secretion and slows gastric emptying, keeping food in your stomach longer so glucose enters your bloodstream more gradually. Doses as low as 4 grams showed some effect, though higher doses (up to 55 grams) produced greater glucose reduction.
If you want to try this approach, having a small whey protein shake or mixing whey into water 15 to 30 minutes before your meal is the typical strategy. This works best before carbohydrate-heavy meals, where blood sugar spikes are most concerning.
Fatty Fish Protects Your Heart
Heart disease is the leading cause of death in people with diabetes, which makes cardiovascular protection a priority when choosing protein sources. Fatty fish like salmon, mackerel, sardines, and herring deliver protein alongside omega-3 fatty acids that directly improve lipid profiles. In people with type 2 diabetes, diets rich in fatty fish produce more pronounced reductions in harmful VLDL cholesterol particles and apolipoprotein B (a marker of cardiovascular risk) compared to other fat sources.
One trade-off worth knowing: some research has found that omega-3-rich diets can modestly raise fasting blood glucose levels. However, the cardiovascular benefits are considered to outweigh this small effect. Aiming for two to three servings of fatty fish per week gives you meaningful heart protection without relying on it as your only protein source.
How Protein Helps With Weight and Appetite
Higher protein intake suppresses hunger more effectively than higher carbohydrate intake, and the hormonal reasons are well documented. A diet providing 30 percent of calories from protein, compared to 15 percent, produces significantly greater increases in GLP-1 and GIP (gut hormones that promote fullness and improve insulin function) while simultaneously reducing ghrelin, the hormone that triggers hunger.
This hormonal shift has real consequences for diabetes management. In one study, the higher-protein diet led to prediabetes remission along with improvements in insulin sensitivity and beta cell function. Weight loss itself improves blood sugar control, so any dietary pattern that naturally reduces appetite without requiring constant willpower has practical value. Protein-rich meals and snacks tend to keep you satisfied longer, reducing the grazing and snacking that can destabilize blood sugar throughout the day.
Eating Protein Before Carbs Matters
The order you eat your food in changes your blood sugar response, sometimes dramatically. A study from Weill Cornell Medicine found that eating vegetables and protein before carbohydrates at the same meal reduced blood sugar levels by about 29 percent at the 30-minute mark, 37 percent at 60 minutes, and 17 percent at 120 minutes, compared to eating carbohydrates first.
This is one of the simplest, most actionable strategies for managing post-meal glucose. If your plate has chicken, salad, and rice, eat the chicken and salad first. Finish with the rice. You don’t need to change what you eat, just the sequence.
Protein Sources to Limit
Processed meats like bacon, sausage, hot dogs, and deli meats combine the insulin-resistance effects of animal protein with added sodium, nitrates, and saturated fat. These are the worst protein choices for someone managing diabetes and cardiovascular risk simultaneously. Red meat in large quantities also increases insulin resistance over time.
When you do eat animal protein, choosing lean cuts makes a difference. Ground meat labeled “lean” contains no more than 15 percent fat. Skinless poultry, pork tenderloin, and egg whites are lower-fat options. But rather than obsessing over trimming fat from animal sources, shifting more of your protein intake toward plants and fish produces better metabolic outcomes overall.
If You Have Kidney Concerns
Diabetes is the most common cause of chronic kidney disease, and protein intake becomes a critical consideration once kidney function starts declining. The 2024 KDIGO guidelines recommend keeping protein at 0.8 grams per kilogram of body weight per day for people with chronic kidney disease, and explicitly warn against exceeding 1.3 grams per kilogram, as higher levels can accelerate kidney damage.
For someone weighing 80 kilograms (about 175 pounds), that ceiling is roughly 64 grams of protein daily, far lower than what many high-protein diets suggest. If your kidney function is reduced, the general advice to eat more protein for blood sugar control may not apply to you. Plant proteins may be easier on the kidneys than animal proteins, but the total amount you consume matters more than the source at that stage. This is one area where your specific lab results should guide your protein decisions.
Putting It Together
A practical protein strategy for diabetes looks like this: build most meals around plant proteins (beans, lentils, tofu, nuts) and fatty fish, use lean poultry or eggs as supporting players, and minimize processed and red meat. If post-meal blood sugar spikes are a persistent problem, consider a small whey protein drink before your largest meals. Eat your protein and vegetables before the carbohydrate portion of your meal.
There is no single “best” protein. The best approach is a pattern: plant-forward, varied, and timed strategically around your carbohydrate intake. That combination addresses insulin resistance, blood sugar spikes, appetite, and cardiovascular risk all at once.