How Many Carbs Should You Eat With Type 1 Diabetes?

Diabetes authorities today are reluctant to broadly recommend an exact level of carbohydrate intake. In recent years, experts have come to recognize that it's possible to achieve good health and good diabetes control by following a wide variety of diets, from very low carb to high-carb.

Your ideal carbohydrate intake is unique to you. “It is quite individualized, but there are certain factors that matter, like a patient’s goals and lifestyle,” says Rekha Kumar, MD, an endocrinologist at NewYork-Presbyterian and Weill Cornell Medicine in New York City.

How much do you exercise? What type of foods do you prefer? How comfortable are you carb counting and changing insulin doses for every meal? The answers to questions like this will help you and your doctor collaborate on an approach that can work for you.

It seems natural: If carbohydrates are the most problematic part of your diet, and the component that most raises your blood sugar, should you just eat less of them?

• A1C reduction
• Weight loss
• Improved blood pressure
• Increased HDL (“good cholesterol”)
• Lower triglycerides

It’s not all good news. Dr. Kumar points to a few downsides of carbohydrate restriction.

Sustainability Some people find low-carb diets a struggle to stick to. “It's just a really small group of people that can adhere to these things for a long period practically speaking,” says Kumar. “There are people with type 1 that do really well on low-carb diets, but these are people that are choosing that and it works for their lifestyle,” she says.

Insulin Changes A low-carb diet can significantly change your insulin requirements. Navigating this change can be tricky, and, if done without care, could be dangerous. “There's such a low margin for error,” says Kumar, “because the lower carbs that someone's eating, it means the lower insulin doses they need, and small miscalculations can cause disproportionate low blood sugar.”

Yes. Some people find diabetes management success while eating a large amount of carbohydrates.

For example, “athletes and super active people need a decent amount of carbohydrates to fuel performance and to prevent a post-exercise drop in blood sugar,” says Kumar.

“‘Quality carbs’ are those in vegetables, beans, lentils, fruit, whole grains, milk, and yogurt. They break down slowly and have key nutrients like fiber or protein, vitamins, and minerals that provide many health benefits,” says Smithson.

Ultimately, it’s your results that matter most. Can you achieve good health and good blood sugar control on your current eating pattern?

“There are individual variations,” says Kumar. “I've heard certain patients with type 1 say, ‘I can eat a bagel, but I can't eat white bread.’ It sounds like it should be the same, but individuals will say different things about pasta versus pizza and the way their own bodies respond.”

Smithson recommends checking your levels before and after a meal: “You can see how different foods or combinations of food work best for you by checking your blood glucose before a meal or snack and then two hours after. As you continue to make changes, watch for blood glucose trends to help guide the best choices for you,” she says.

It might take some experimentation and effort, and the collaboration of your diabetes care team, to determine the best amount of carbs for you to eat. It’s also wise to discuss any interest you have in specific diets and discuss how to incorporate them safely.

“Everyone's health journey is unique, so eating patterns need to be individualized to include other health conditions (like heart, kidney, or liver disease), food preferences, cultural foods, cooking skills, and accessibility to healthy food choices,” says Smithson.

It’s also possible for your carbohydrate needs to change with time. “There are many life scenarios that would change the amount of recommended carbs or the amount of recommended insulin per carbohydrate,” says Kumar. For example, “if somebody develops more muscle mass, and they're more fit, their insulin sensitivity will improve, and their blood sugar spikes less in response to carbohydrates.”

Based on changes that can happen, Kumar says that the relationship between patients and specialists remains important over time. “Having a good diabetes team, like a nutritionist and a diabetes educator is important, even if patients only check in once every several years when something changes.”

• There is no single recommended amount of carbohydrates for people with type 1 diabetes, as the ideal intake varies based on individual factors like activity level, food preferences, and lifestyle.
• A diet with fewer carbs can improve blood sugar control, reduce insulin needs, and increase time in range, but very low carb diets may not be sustainable for everyone and lack long-term safety research.
• Focusing on high-quality carbohydrates from whole grains, vegetables, fruits, and legumes rather than refined carbs can lead to better blood sugar control and long-term health outcomes.
• Work with your diabetes care team to find the right carbohydrate balance for you, and monitor your blood sugar responses to different foods to understand how your own body reacts.