All About Carbs: Which Ones, How Much, and Is Low-Carb Best for Preventing Diabetes?

August 5, 2026
Summary
Webinar Q&A

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Summary

In This Webinar

  • What are carbohydrates? 
  • Types of carbohydrates
  • Effect of carbohydrates on weight and health
  • How many carbs are best? 
  • Strategies for optimizing carbohydrates in your routine

Carbohydrates Are Macronutrients - Sources of Calories in Food

The main macronutrients are fat, protein, and carbohydrates. 

TABLE

Food Sources of Carbohydrates Are Varied

Some are more nutritious than others. Some come with nutrients like fiber, water, protein, or healthy fats. Others carry excess saturated fats and added sugars. 

Carbohydrates & Macronutrients
Carbohydrates (“Carbs”) – Macronutrients Contribute Calories
Macronutrient Energy Density Common Food Sources
Carbohydrates 4 calories per gram Grains/grain products, fruit, beans, starchy vegetables, sugar-sweetened foods and beverages, milk/yogurt
Protein 4 calories per gram Fish, eggs, beans, nuts, peanuts, chicken, beef, pork, turkey, soybeans, tofu, dairy
Fat 9 calories per gram Butter, oil, avocado, nuts, peanuts, seeds, fatty fish

Types of Carbohydrates in Food

Types of Carbohydrates in Food
Types of Carbohydrates in Food
Type of Carbohydrate Key Points Food Sources
Sugars
  • 4 calories per gram
  • Small units broken down quickly
  • Types: glucose, fructose, sucrose (table sugar)
  • Raises blood sugar
Sodas, sweet tea, coffee drinks, candy, desserts, breakfast pastries, sweet cereals, flavored yogurt, and oatmeal
Starches
  • 4 calories per gram
  • "Complex carbs" (long chains of glucose)
  • Some digest faster than others
  • Raises blood sugar
Whole and refined grain products, potatoes, other starchy vegetables (yams, peas, corn, acorn squash)
Dietary Fiber
  • 0–2 calories per gram
  • Not fully digested by the body
  • Digested by gut bacteria
  • Supports weight, digestion, blood sugar, cholesterol, and blood pressure
Whole-grain products, vegetables, fruit, beans, nuts, seeds

How Do Carbohydrates Affect Weight and Blood Sugar?

Weight and blood sugar are important for chronic health. 

Weight and Carbohydrates

High-carb foods are often high in calories. Processed high-carb foods can be high in calories and not very filling. Consider a cookie with carbohydrates from sugar and flour, and fat from butter. It’s calorie-dense and low in filling nutrients like fiber, water, and protein. 

Blood Sugar and Carbohydrates

Sugars and starches raise blood sugar. They raise blood sugar even faster if you don’t eat them with a source of fiber, protein, and/or healthy fat. Frequent sudden and high blood sugar spikes raise diabetes risk Drops in blood sugar can cause hunger and cravings for starch. 

In addition, high-carb foods with a high glycemic index can lead to hunger soon after eating.‍

Are Carbohydrates Good? Are Carbohydrates Bad?

Carbs can have…

  • Antioxidants
  • Fiber
  • Vitamins
  • Minerals
Less Processed Carbohydrates and Health Benefits
Types of Less Processed Carbohydrates & Health Benefits
Types of Less Processed Carbohydrates Linked to Lower Risk For…
  • Whole grains (brown rice, whole-wheat pasta and bread, whole-grain cereal, oatmeal)
  • Fruit (fresh, frozen)
  • Legumes (beans, split peas, lentils)
  • Reduced-fat dairy (milk, yogurt)
  • Diabetes
  • Cardiovascular disease
  • Colorectal cancer
  • Gastrointestinal conditions
  • Overweight

Carbs can be…

  • High in calories and solid fats
  • Low in essential nutrients
Processed Carbohydrates and Health Risks
Types of More Processed Carbohydrates & Health Risks
Types of More Processed Carbohydrates Linked to Higher Risk For…
  • Refined starches
  • Sugar-sweetened foods
  • Sugar-sweetened beverages
  • Potatoes (especially fried, prepared with fat)
  • Diabetes
  • Cardiovascular disease
  • Colorectal cancer
  • Weight gain
  • Dental caries
  • Fatty liver disease (NAFLD)

What’s A Serving of Carbohydrates?

A “serving size” of carbohydrates is the amount of food that contains 15 grams of carbohydrates. Here are some examples. 

Carbohydrate Portion Sizes
Common Carbohydrate Serving Sizes
Food Category Serving Sizes
Grains
  • 1 slice bread, ½ English muffin, or 1 corn tortilla
  • ½ cup cooked oatmeal, rice, pasta, or barley
  • 1 cup puffed cereal
  • ½ ounce pretzels
Fruit
  • 1 small apple, pear, orange, or peach
  • 1 cup cut melon or strawberries
  • 2 apricots, plums, or tangerines
  • ¾ cup grapes or blueberries
Starchy Vegetables
  • ½ cup corn or peas
  • ¾ cup acorn or butternut squash
  • ½ cup sweet potatoes or potatoes

How Many Carbohydrates Per Day? Here’s a Look!

The average American gets 46% of calories from carbohydrates, or about 250 grams per day. Here are some other numbers.

  • Daily Value (DV): at least 130 grams per day
  • Dietary Guidelines and acceptable macronutrient distribution range (AMDR) (the amount that has been shown to help provide an adequate diet and manage weight long-term): 45-65% of total calories
  • Elite endurance athletes: 70% or more
  • Moderately low-carb: about 40% or less
  • Keto or very low-carb: about 5 to 10% of total calories, or 20 to 50 grams of carbs per day. Be sure to ask your doctor before going on any diet, especially an extreme one!

How Many Carbohydrates Should You Have to Prevent Diabetes? 

Goals are to lose weight and reduce the severity and frequency of insulin spikes. Research says…

  • Moderately low-carb can be good for weight and blood sugar
  • Keto has unknown long-term effects on health and weight
  • Consumption of whole grains is linked to lower risk for diabetes.

The right amount of carbohydrates for YOU is the amount that can be sustainable and healthy for YOU! Consider…

  • Life fits in: You can enjoy special occasions and you can find foods on your plan wherever you go
  • Foods you enjoy: So you don’t feel deprived!
  • Foods are healthy: A low-carb diet could be high in nutrients with foods like olive oil, egg whites, and fish, or low in nutrients with foods like bacon, steak, and butter. And, a high-carb diet could be high in nutrients with foods like oatmeal, yams, and fruit, or low in nutrients with foods like French fries, white bread, and soda.

Low-Carb Diets and Prediabetes Tips

  • Stay full - non-starchy vegetables and lean proteins can help you stay full without many carbohydrates
  • Watch fats - fats like olive oil, avocados, nuts, seeds, and canola oil can support heart health and metabolic health
  • Think long-term - A sustainable plan is enjoyable and has foods you can get anywhere and enjoy with other people

Ask your doctor what a good carb plan is for you!

Tip: Shift portions and macronutrients

Swap protein for carbs

  • Egg and vegetable scramble instead waffles
  • Cottage cheese, PB, or yogurt instead of syrup on pancakes
  • String cheese, edamame, or nuts instead of crackers or chips

Have lower-carb or healthier snacks

  • Popcorn, whole-grain crackers, or fruit instead of chips or pretzels
  • Vegetables or whole-grain crackers with guacamole, salsa, or bean dip instead of chips and creamy dip

Shift portions to reduce calories and carbs

  • Fill your bowl with less granola and more fruit and almond milk
  • Have less pasta and more vegetable noodles, marinara sauce, and/or chicken and shrimp

Reduce added sugars

  • Water or sparkling water instead of soda, fruit drinks, sports drinks
  • Black coffee or with a splash of milk, unsweetened tea
  • Plain yogurt, regular oatmeal
  • Unsweetened frozen fruit, unsweetened applesauce
  • Add cinnamon or fruit to yogurt, cottage cheese, and oatmeal
  • Use banana or ripe pear on peanut butter sandwiches instead of jam
  • Try small servings of cheese, peanut butter, and nuts for treats

Add non-starchy vegetables and choose higher-fiber carbohydrates

  • Side dishes: side green salad, side of vegetables
  • Swap for high-carb sides: riced cauliflower for rice, vegetable noodles for pasta, mashed cauliflower for mashed potatoes
  • Whole grains instead of refined bread, cereal, pasta, rice

After This Webinar…

  • Are your portion sizes on track?
  • Are there swaps you can make to get more fiber or protein from carbs?
  • How can you fit carbohydrates into balanced and filling meals?

Health Coach Q & A

What links should I know about? 

Lark is here to help!

Lark Customer Support!

https://support.lark.com/hc/en-us/requests/new

Here’s the worksheet mentioned in the webinar. 

https://www.lark.com/resources/lark-printable-motivation-worksheet

Facebook page for DPP

https://www.facebook.com/groups/larkdpp

Lark blog

https://www.lark.com/blog

Lark recipes

https://www.lark.com/resource-type/recipe

Email a Lark coach with questions or to make an appointment

coaching@lark.com

https://app.acuityscheduling.com/schedule.php?owner=21319234

I'm a terrible cook, do you have an area of recipes that are low carb that we can look at?

That’s a great question! You don’t have to be a good cook to eat nutritious meals and snacks that are not high in carbs!

Here are a few types of low-carb foods that are easy to make or are ready to eat. 

  • Chicken, fish, shellfish - just bake or grill them
  • Plain yogurt, low-fat cheese, low-fat cottage cheese, canned/pouch tuna and salmon - ready to eat
  • Peanut butter, nuts, peanuts - ready to eat
  • Eggs - hard-boiled or in a pan with cooking spray, such as scrambled or an omelet - add chopped vegetables (raw or cooked) as desired
  • Canned low-sodium beans - ready to eat
  • It’s also easy to put together stir fry, stews, sheet pan meals (protein plus vegetables), and salads without being a good cook. 

Here is a link to our recipe database - please feel free to browse! You can always reach out to a coach for more information or to get recipe ideas that are in line with your preferences. Email coaching@lark.com

What about Special k protein cereal?

That’s a great question! It is a good reminder to always read the label - both the nutrition facts panel and the list of ingredients!

  • A 1 ⅓-cup serving of Special K has 200 calories, 9 grams of sugar, 6 grams of fiber, and 10 grams of protein. Its first three ingredients are whole-grain wheat, white rice, and sugar. There is also some protein from soy protein isolate. 
  • In comparison, a 1 ⅓ cup serving of plain Cheerios has 140 calories, 1 gram of added sugar, and 5 grams of protein. Its leading ingredient is whole grain oats. 

For a high-fiber, low-carb breakfast, unsweetened cereals can be a nutritious choice - aim for less than 4 grams of added sugars per serving. They can be healthiest with some additional fiber, such as from fruit, and some protein, such as skim milk, egg whites, or cottage cheese, for example.

Do you have thoughts about Xylitol as a sweetener?

Xylitol is a sugar substitute. It’s a sugar alcohol - it tastes like sugar, but it has 40% fewer calories than sugar. It’s common in sugar-free gum, sugar-free mints, sugar-free candies, and other sugar-free or keto products. 

Here are some benefits of xylitol.

  • It has 40% fewer calories compared to the same amount of sugar.
  • It doesn’t cause big spikes in blood sugar or insulin.
  • It’s good for teeth - there’s some evidence that it fights against tooth decay.

Here are some concerns.

  • It can give you an upset stomach if you eat too much of it. Individual tolerance can vary.
  • Consuming large amounts of xylitol may be linked to heart issues.

It’s best to talk to your healthcare provider about its benefits and risks!

My partner says brown rice contains traces of arsenic. Is that true?

Yes, brown rice has traces of arsenic. Rice absorbs more arsenic from soil because it’s grown in flooded conditions. Arsenic builds up mainly in the outer bran layer of the grain - so it’s stripped away in white rice, but stays in brown rice. 

The general recommendation is to eat a balanced variety of whole grains. Brown rice still has a lower glycemic index, some fiber, and additional benefits of whole grains. You can reduce the amount of arsenic by using extra water to boil the rice and draining the rice after it’s cooked. 

Are bananas really that bad?

That’s a common concern - bananas can have more than 30 grams of carbohydrates, or 2 servings of carbohydrates, and they’re low in protein. That means they can raise blood sugar. 

  • But bananas can have a lot of benefits!
  • Nutrients like fiber, potassium, magnesium
  • A nutrient called resistant starch, which is like fiber because it feeds healthy gut bacteria and reduces blood sugar spikes

To get more benefits:

  • Choose less ripe bananas. They’re higher in resistant starch and they spike blood sugar less.
  • Have small bananas or ½ of a large one. 
  • Consume your banana with healthy fat or protein - like 1 tablespoon of peanut butter, some egg whites, or yogurt or cottage cheese.

How do I increase my healthy bacteria and what foods will help?

Increasing healthy gut bacteria is a great goal - the same things that can help improve your gut bacteria profile can help with weight, blood sugar, and digestion! The two major things you can do is support probiotics (healthy bacteria) and choose prebiotics (foods to fuel their growth).

Probiotics foods contain live, friendly bacteria that move into your digestive tract. They are in some types of fermented foods. Here are some examples - though not all brands and varieties have them. 

  • Yogurt (check for “live and active cultures” on the label)
  • Kefir
  • Sauerkraut and kimchi
  • Tempeh and miso
  • Kombucha (watch out for added sugars)

Prebiotic fiber can help feed healthy gut bacteria. Here are sources. 

  • Vegetables
  • Legumes (beans, split peas, lentils)
  • Whole grains
  • Fruit
  • Nuts

In addition, reducing sugar-sweetened foods, getting plenty of sleep, and managing stress support a healthy gut. 

Breakfast- what should I do differently as far as portion control- A packet of oatmeal, handful of Pumpkin seeds,2T flax, 2T chia, blueberries, and then I add in 2 scoops of protein powder that was mixed with water to smooth out.   Topped with Cinnamon.

This breakfast is full of wholesome, nutritious foods - fiber, healthy fats, antioxidants, protein, and whole grains. In terms of trying to lose weight, this breakfast may get in the way because it is calorie-dense - it has a lot of calories and not much volume. 

Here are a few observations.

  • You have 6 tablespoons of seeds - very healthy because of protein, fat, and fiber, but contributing about 300 calories.
  • You have 2 scoops of protein powder - likely contributing 20-40 grams of protein.
  • Plain oatmeal, blueberries, and cinnamon are great choices.

For a lower-calorie meal that is still high in protein and healthy fats, but lower in calories and more filling, you might consider:

  • Having half the seeds (1 tablespoon of each type)
  • Having just 1 scoop of protein powder
  • Keeping the oatmeal, blueberries, and cinnamon

This leaves you with more than 20 grams of protein, which is plenty for a meal. It cuts calories by over 200, so it supports weight loss.

If you’re still hungry, consider more berries or some egg whites.

Tic tacs.  I see the are 0 carbs.  For 1mint.  Do carbs start adding up for them?   If u eat more…Is it a good treat when u need a little pick me up.  Just a tiny  treat?

Tic tacs are low in sugar for just 1-2 mints. If you have an entire box, you’ll get close to 20 grams of carbohydrates. So, they’re a great treat, but keep in mind that they’re meant to be eaten in small quantities - as a mint, and not as a filling snack.

Is there a document that shows foods and how much they spike insulin…like an insulin index or something?

There is actually an Insulin Index. In addition, a more well-known index is the glycemic index (GI) - it measures how fast a food raises blood glucose, and many foods have a GI that mirrors the insulin response. 

Here are a couple of resources

https://glycemicindex.com/

https://guidelines.diabetes.ca/GuideLines/media/Docs/Patient%20Resources/glycemic-index-food-guide.pdf

Overall, the recommendations remain the same: choose higher-fiber carbs, watch portion sizes, and pair carbs with protein, fiber, and healthy fats!

A guide I can print out would be great as far as carbs!!

Here are a couple of resources! Our Lark blog has an explanation of some food choices and their carbohydrates. 

https://www.lark.com/resources/high-carb-foods-and-low-carb-foods

Also, here’s a link to a printable pdf with carb counts

https://diabetes.my.dukehealth.org/sites/default/files/2022-03/Food%20Lists%20and%20Meal%20Plannig.pdf

Watermelon….too many carbs?

It’s all about portion size and what you eat it with! Watermelon has nutrients like lycopene and vitamins A and C. It has 12 grams of carbs per cup - so if you eat several large wedges of watermelon, you’ll be getting a lot of carbs - but if you keep it to 1-2 cups, you’ll be keeping portions in check. 

As with any carb, it’s healthiest to pair watermelon with protein or healthy fats. Here are some examples.

  • Watermelon with feta cheese
  • Watermelon with ½ ounce of nuts
  • Watermelon and Greek yogurt or cottage cheese

Should I be eating in a certain order?  Carbs , protein, fruits , veggies, fats?

Actually…yes! There is research to suggest that the order in which you eat your foods matters! In general, it appears that eating vegetables first, carbohydrates last, and lean proteins after vegetables can help with weight management and blood sugar control!

That could mean having a salad or some vegetable soup first, or just eating your vegetables out of your sandwich first!

The Zero Sugar drinks are not really a good option because of the insulin response to the artificial sweetener?

Recent studies show that using artificial sweeteners long-term doesn't really lead to lasting weight loss, and it might even affect gut health over time. That's why the ADA now says zero-sugar drinks are okay only as a short-term stepping stone to help cut out sugary sodas. The ultimate goal for long-term health and weight loss is to drink plain or sparkling water!

OUR next live webinar

Snacks and Your Goals: Navigating Smart Choices for Weight Loss and Wellness

August 19, 2026 12:30 PM
Members of Lark's Diabetes Prevention Program can check your emails for registration information! Not a member? See if you're eligible for live webinar access and more.

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