That mid-afternoon crash when your focus disappears and your eyelids feel heavy? Your blood sugar is likely involved. Keeping glucose levels stable throughout the day is one of the most effective ways to feel more energized, mentally sharp and satisfied between meals and it doesn’t require an overhaul of the way you eat.
Registered dietitians who specialize in blood sugar health say that over time, constant glucose fluctuations can fuel insulin resistance, systemic inflammation and a higher risk of conditions like heart disease and type 2 diabetes. But certain foods including a few you might have written off can meaningfully support balance. Here are the four foods dietitians say may help, along with the lifestyle habits that round out the picture.
Berries
Many people are surprised to learn that fruit particularly berries belongs in a blood sugar-friendly diet. The assumption that all fruit spikes glucose has led many to avoid it entirely, but that thinking misses a bigger picture.
Raspberries, blueberries and strawberries carry some of the highest fiber content among fruits, which supports slower digestion and a more gradual rise in blood glucose. What makes berries especially notable is their polyphenol content, particularly anthocyanins the plant pigments responsible for those deep red, blue and purple hues. Research suggests these compounds may support how well the body responds to glucose and improve key markers of blood sugar control.
Full-fat Greek yogurt
Greek yogurt checks several boxes for blood sugar support. Its combination of protein and fat slows digestion, resulting in a more gradual release of glucose into the bloodstream exactly what you want after a meal. Protein is widely considered one of the most important nutrients for blood sugar regulation because of this effect.
There is also growing research linking fermented dairy to better metabolic health. In 2024, the FDA issued a qualified health claim recognizing yogurt’s association with a reduced risk of type 2 diabetes. Scientists believe fermented dairy may support insulin sensitivity through changes in the gut microbiome and the production of short-chain fatty acids. For the most benefit, choose plain, unsweetened varieties flavored options can quietly pack in several teaspoons of added sugar per serving.
Potatoes
Potatoes have been unfairly cast as a food to avoid for blood sugar, but dietitians push back on that narrative. One medium potato with the skin on delivers 4 grams of fiber, along with potassium and other nutrients that support cardiovascular health. The key, according to dietitians, is in the preparation.
Cooking and then chilling potatoes rather than eating them hot significantly increases their resistant starch content. This type of starch bypasses digestion in the small intestine and travels to the large intestine, where it feeds beneficial gut bacteria. Research shows that chilled potatoes produce a notably lower glucose and insulin response compared to freshly cooked ones. Think potato salad or reheated leftovers. Pairing potatoes with a source of protein or healthy fat helps steady the response even further.
Nuts
Nuts are often lumped in with high-fat snacks to limit, but research tells a different story. Studies suggest regular nut consumption may play a meaningful role in both the prevention and management of type 2 diabetes.
Their combination of unsaturated fatty acids, plant-based protein, fiber and minerals works together to slow digestion and reduce post-meal glucose spikes. Nuts also contain polyphenols and other bioactive compounds linked to improved insulin sensitivity and reduced inflammation over time. Almonds, walnuts and pistachios are among the most studied for glycemic control. A small handful about 1 ounce makes an easy snack, or they can be stirred into oatmeal, yogurt or a salad.
Lifestyle habits that support blood sugar balance
Food choices are only part of the equation. Dietitians consistently point to four evidence-backed habits that work alongside a balanced diet.
First, movement matters especially right after eating. Even a 10-minute walk following a meal has been shown to meaningfully lower post-meal blood sugar, and total daily activity may matter more for metabolic health than any single workout. Second, sleep quality plays a direct role in how efficiently the body processes glucose. Even modest, ongoing sleep restriction can increase insulin resistance, and most adults need between seven and nine hours a night.
Third, managing chronic stress is worth taking seriously. Cortisol, the body’s primary stress hormone, signals the liver to release more glucose into the bloodstream a mechanism that can keep blood sugar elevated even when diet is otherwise on track. Simple practices like deep breathing, yoga or a daily walk can help. Finally, staying well-hydrated prevents glucose from becoming overly concentrated in the blood, which can cause temporary spikes. Pairing carbohydrates with protein, fat or fiber at every meal rounds out a practical, sustainable approach.
