The foods that cause the most trouble for people with diabetes are the ones that spike blood sugar quickly, increase insulin resistance over time, or both. That means refined carbohydrates, sugary drinks, and certain processed foods top the list. But some foods that sound healthy, like flavored yogurt, dried fruit, and certain cocktails, can be just as problematic. Here’s what to limit or avoid and why it matters.
White Bread, White Rice, and Refined Grains
Refined grains are stripped of their fiber and outer layers during processing, which means your body converts them into glucose fast. White bread, bagels, rice cakes, most crackers, croissants, and packaged breakfast cereals all have a glycemic index of 70 or higher. For context, pure glucose scores 100 on the glycemic index scale. A food scoring 95 raises your blood sugar almost identically to eating straight glucose.
The problem isn’t just the spike itself. Rapid blood sugar surges force your body to release large amounts of insulin, and over time, repeated spikes contribute to worsening insulin resistance. Swapping white rice for brown rice, or white bread for a dense whole-grain loaf, slows digestion and produces a more gradual rise in blood sugar. The fiber in whole grains acts as a speed bump.
Sugary Drinks and Fruit Juice
Sodas, sweet teas, energy drinks, and fruit juices are among the fastest ways to flood your bloodstream with sugar. A single 12-ounce can of regular soda contains around 39 grams of sugar, and because it’s liquid, your body absorbs it almost immediately. There’s no fiber to slow things down.
Fruit juice is deceptive. Even 100% orange juice delivers a concentrated sugar hit without the fiber you’d get from eating a whole orange. A cup of apple juice can contain as much sugar as a cup of soda. If you enjoy fruit, eat it whole. The intact fiber changes how your body processes the sugar.
Packaged Baked Goods and Fried Foods
Doughnuts, packaged pastries, cookies, cakes, and many fast-food items deliver a double hit: refined flour that spikes blood sugar plus unhealthy fats that worsen insulin resistance. Many of these products historically relied on partially hydrogenated oils, a source of trans fats. While the FDA banned added trans fats in the U.S. food supply, small amounts still show up in some processed foods, and deep-fried items at restaurants remain a concern.
Trans fats promote inflammation throughout the body, and animal studies show they directly increase resistance to insulin, which is the core problem in type 2 diabetes. They also raise the risk of heart disease and stroke, conditions people with diabetes are already more vulnerable to. Vegetable shortenings, some margarines, and commercially fried foods are the most common sources.
Dried Fruit and Sweetened Snacks That Seem Healthy
Dried fruit is a concentrated sugar bomb. Removing the water shrinks the fruit but leaves all the sugar behind in a much smaller package, making it easy to eat large amounts quickly. One hundred grams of fresh apple contains 10 grams of sugar. The same weight of dried apple contains 57 grams, nearly six times as much. Dried mangoes, cranberries (often coated in extra sugar), and raisins are similarly concentrated.
Granola bars, trail mixes with candy pieces, and “fruit snacks” fall into the same trap. They’re marketed as wholesome but often contain as much sugar as a candy bar. Check the label: sugar goes by at least 61 different names on ingredient lists, including agave nectar, barley malt syrup, cane juice crystals, coconut sugar, and caramel. If several of these appear in a single product, that food is essentially built on sugar.
Flavored Yogurt
Plain, unsweetened yogurt is a reasonable food for people with diabetes. Flavored yogurt is a different product entirely. A fat-free plain Greek yogurt contains about 4 grams of sugar per 100 grams, all from the naturally occurring lactose in milk. Flavored varieties can contain 12 to 21 grams of sugar per 100 grams, with roughly 15 grams of that coming from added sugar. Some whipped or dessert-style yogurts are closer to pudding than a health food.
If you like yogurt, start with plain Greek yogurt and add your own fresh berries. You’ll control exactly how much sugar goes in, and you’ll get the protein and probiotics without the blood sugar spike.
High-Sodium Processed Foods
Diabetes and high blood pressure frequently go hand in hand, and excess sodium makes blood pressure harder to control. Processed meats like bacon, deli turkey, hot dogs, and sausages are major sodium sources. Canned soups, frozen meals, soy sauce, and many condiments are too. A single serving of canned soup can deliver half your daily sodium in one bowl.
The American Heart Association recommends no more than 2,300 milligrams of sodium per day, with an ideal target of 1,500 milligrams for most adults. For perspective, a single teaspoon of table salt contains about 2,300 milligrams. Most people with diabetes benefit from tracking sodium because cardiovascular disease is the leading cause of death in this population. Reading labels and cooking at home more often are the most practical ways to cut back.
Alcohol: What to Know
Alcohol creates a unique and sometimes dangerous situation for people with diabetes, especially those taking insulin or medications that lower blood sugar. Normally, your liver steadily releases stored glucose to keep blood sugar stable. When you drink, the liver prioritizes breaking down alcohol and does a poor job releasing glucose. This can cause blood sugar to drop, sometimes dangerously low.
Each drink takes about 1 to 1.5 hours for the liver to process, and the risk of low blood sugar lasts that entire time. Two drinks means 2 to 3 hours of risk. In severe cases, even a glucagon injection (the emergency rescue for low blood sugar) may not work properly because it relies on the liver to release glucose, and alcohol blocks that process.
On top of the hypoglycemia risk, many popular drinks are loaded with carbohydrates. A piña colada packs 32 grams of carbs in a small 4.5-ounce serving. Margaritas contain about 29 grams, and wine coolers come in around 30 grams per 12-ounce bottle. Even a gin and tonic has 16 grams, mostly from the tonic water. If you do drink, dry wines and light beers tend to be lower in carbs, and eating food alongside alcohol helps buffer the blood sugar drop.
A Practical Way to Think About It
Rather than memorizing a list of banned foods, focus on a simple principle: the more processed a food is, the faster it hits your bloodstream. Whole foods with intact fiber, protein, and healthy fat slow digestion and produce gentler blood sugar curves. When you do eat carbohydrates, pairing them with protein or fat (an apple with peanut butter, for example) blunts the glucose spike.
Reading nutrition labels becomes second nature with practice. Look at total carbohydrates, not just the “sugars” line, because all digestible carbs eventually become glucose. Pay attention to serving sizes, since many packages contain two or three servings but look like a single portion. And scan the ingredient list for the dozens of sugar aliases manufacturers use to make products appear healthier than they are.