by Lori Skurbe, RDN, LDN, CDCES, MPH
Social media has made nutrition advice more accessible than ever, but not all of it is accurate. One persistent myth that refuses to disappear is the belief that carbs make you fat.
Let’s examine what the science actually says.
What Are Carbohydrates?
All foods are made of 3 macronutrients (macros):
- Fat
- Protein
- Carbohydrates (carbs)
Some foods have just one macronutrient, while others contain two or all three. These macronutrients provide energy (calories):
- Protein: 4 calories per gram
- Carbohydrates: 4 calories per gram
- Fat: 9 calories per gram.
Carbohydrates include sugars (natural and added), starches, and dietary fiber.
Do Carbs Cause Weight Gain?
When it comes to weight gain or loss, calorie balance is key.
To gain weight, we must consistently consume more calories than we burn (use). Excess calories from any source are stored as body fat. To lose weight, the opposite must occur: we need to consistently consume fewer calories than we burn, creating a calorie deficit. When that happens, the body uses stored fat for energy.
It’s important to note that carbohydrates provide the same number of calories per gram as protein and roughly half as many as fat. If carbohydrates are included in a diet while total calorie intake remains below what the body burns, weight loss will still occur. Sustainable weight loss requires a calorie deficit regardless of the proportion of macronutrients consumed.
Are Carbohydrates Healthy?
Many carbohydrate-rich foods are highly nutritious, including fruits, vegetables, whole grains, and legumes (beans and lentils). These foods provide essential vitamins, minerals, antioxidants, and dietary fiber – nutrients that support heart health, digestive health, metabolic function, and longevity.
Eliminating or drastically limiting carbohydrates can reduce intake of these beneficial nutrients.
What About Added Sugar?
Some carbohydrate-containing foods also contain significant amounts of added sugar. Added sugars are incorporated during food processing to enhance flavor. When consumed frequently, foods and beverages high in added sugar can increase total calorie intake and make weight management more difficult.
This is not because they are carbohydrates, it is because they are easy to overconsume and often lack the fiber and nutrients that promote satiety. Limiting added sugars while prioritizing whole, nutrient-dense carbohydrate sources supports better overall health.
The Bottom Line
Remember, fat gain occurs when we consistently consume more calories than our body needs, not simply because we eat carbohydrates. There is no scientific reason to eliminate carbs for weight loss. Balanced meals combined with a consistent calorie deficit support sustainable weight management.
Schedule a consultation to learn how a personalized nutrition strategy can support your long-term healthspan.