Nutrition for diabetes and insulin resistance

Nutrition is one of the most powerful tools for managing diabetes and insulin resistance. The good news: it isn't about banning everything, but about learning to eat in a way that keeps your blood sugar stable.

What happens with blood sugar

When you eat carbohydrates (rice, arepa, bread, fruit, sweets), your body turns them into glucose, the sugar that circulates in your blood. Insulin is the hormone in charge of moving that glucose into your cells to be used as energy. With insulin resistance, your cells respond less and less to that signal, and in type 2 diabetes the pancreas often cannot fully compensate for that resistance. The result in both cases: glucose stays elevated longer than it should.

That is why what matters most isn't just visible "sugar," but the quality and combination of your meals: how much they raise your glucose and how fast. This is called the glycemic response. In simple terms: a refined carb eaten on its own (a juice, white bread on an empty stomach) tends to produce a fast glucose spike, while that same carb in a whole-grain version, in a moderate portion and paired with fiber, protein or fat, tends to produce a slower, steadier curve. The exact response varies from person to person, but the principle works well as a practical everyday guide. In fact, the World Health Organization lists healthy eating and physical activity among the pillars of type 2 diabetes management, alongside medical treatment.

The plate method: the simplest place to start

If counting carbs overwhelms you, start here. The plate method is the tool I usually teach first in consultation because it requires no weighing or math, and the American Diabetes Association recommends it as a starting point. Take a medium plate (about 9 inches) and divide it like this:

• Half the plate: non-starchy vegetables. Salad, broccoli, carrots, tomato, zucchini, mushrooms. They add volume, fiber and fullness with very little impact on glucose.
• A quarter of the plate: protein. Chicken, fish, eggs, lean meat, cheese, or plant-based combinations like beans with rice (counting the beans as carbs too).
• A quarter of the plate: carbohydrates. Rice, arepa, potato, plantain, pasta or legumes. This is where mindful portions come in, not bans.

To drink, water or unsweetened beverages. The beauty of this method is that it travels with you: it works the same at home, at a restaurant or with the set lunch menu around the corner, no scales or apps required.

What to prioritize

• Vegetables and fiber in abundance: they slow sugar absorption and increase fullness. Try to have them at lunch and dinner, not just as decoration.
• Quality protein at every meal (eggs, chicken, fish, meat, dairy, legumes): it supports fullness and helps keep glucose steadier between meals.
• Healthy fats such as avocado, olive oil, nuts and seeds: they don't raise glucose and make meals more satisfying.
• Whole-grain carbs and legumes (beans, lentils, chickpeas) in appropriate portions: their fiber tends to produce a gentler glycemic response than refined flours.
• Reasonably stable meal times: complete, well-ordered meals tend to make control easier, especially if you take medication.

What to cut back on

• Sugary drinks and juices, even natural ones: liquid sugar reaches the blood very fast and barely produces any fullness.
• Refined flours and ultra-processed foods (snack packs, cookies, industrial baked goods): they combine flour, sugar and low-quality fats in portions that are easy to overeat.
• Carbs "alone": a plain arepa, plain bread or juice on an empty stomach tends to raise glucose more than those same foods paired with protein, fat or fiber.
• Too many carbs in one meal: rice, potato, arepa and juice on a single plate is the hardest combination to manage. Pick one or two and enjoy them.

If you want to dig deeper into the basics of eating for diabetes, MedlinePlus (the health library of the U.S. National Institutes of Health) has a clear, reliable guide.

Arepa, rice and plantain: agreements, not bans

My philosophy in consultation is not to forbid foods but to reach agreements. And that applies above all to the carbs on our Colombian table: a diet that takes away your arepa tends to last two weeks; a sensible agreement with the arepa serves you for life.

• Arepa: one per meal, ideally whole-corn, and always accompanied: with eggs, cheese or avocado instead of on its own. That way it becomes part of a complete meal rather than a glucose spike.
• Rice: a portion about the size of your fist, within the carbohydrate quarter of your plate. The traditional pairing of rice with beans or lentils adds fiber and plant protein, and tends to behave better than rice alone.
• Plantain: a small portion, preferably baked or boiled rather than fried. Very ripe plantain tends to raise glucose faster than green plantain, so adjust the portion to how ripe it is.
• Fruit: whole, not juiced, ideally with some protein or fat (for example, mango with a handful of nuts, or with unsweetened yogurt).

Small changes, big impact

The order of foods matters: starting your meal with vegetables and protein, and leaving the carbs for last, may help flatten the glucose spike. Walking 10 to 15 minutes after your main meals also tends to improve blood sugar control, because moving muscle uses up glucose. These are small, free, sustainable adjustments that add up to a real difference.

Beyond the plate: movement, sleep and stress

Glucose doesn't respond only to food. Regular exercise, especially strength training, helps your muscles take up glucose with less insulin, which is why it's one of the best allies against insulin resistance. Sleep counts too: evidence suggests that short or poor sleep may worsen insulin sensitivity and increase carb cravings the next day. And sustained stress can raise glucose through hormones like cortisol. You don't need to fix everything at once: picking one front (a walk after meals, going to bed half an hour earlier) is already progress.

If you take medication: watch for hypoglycemia

If you use insulin or medications that increase insulin production, changing your diet on your own (skipping meals, cutting carbs drastically, starting intense exercise) can trigger hypoglycemia: blood sugar that drops too low. Common warning signs include shakiness, cold sweats, dizziness, intense hunger, confusion or irritability; you can read more at MedlinePlus. Two safety rules: never adjust or stop a medication on your own, and coordinate any major dietary change with your treating physician, so the plan and the treatment move forward together.

When to seek medical nutrition support

You can start today with the plate method and the agreements in this article. That said, professional support is worth it if you've just been diagnosed, if your glucose or your HbA1c isn't improving despite your efforts, if you take medication and want to change your diet safely, or if you have prediabetes or insulin resistance and want to reduce the risk of progressing to diabetes. As a physician with a master's in Nutrition and Food, my job is to translate your labs and your treatment into a plan that fits your real life, coordinated with your treating physician and with follow-up to adjust along the way.

Frequently asked questions

This article is informational and does not replace a medical consultation. For a plan based on your diagnosis and labs, book a clinical nutrition consultation.

Dr. Andrea Pérez Jaramillo Physician with a master's in Nutrition and Food (University of Barcelona). In-person care in Medellín and online, in English and Spanish. Learn more →