A medium ear of boiled or steamed sweet corn is more than just a summer barbecue staple; it is a complex package of dietary fiber, essential vitamins, and potent antioxidants. For those tracking their macros or looking to optimize their nutrient intake, understanding the precise corn on the cob nutrition data is the first step toward making informed dietary choices.

On average, a medium ear of corn (approximately 6.75 to 7.5 inches long) contains between 75 and 90 calories. However, this figure only scratches the surface. Depending on the variety, soil quality, and preparation method, the nutritional density of corn can vary significantly.

The Essential Core of Corn on the Cob Nutrition Data

When we look at the raw data for one medium ear of plain sweet corn, the profile is balanced and heart-healthy. Here is the foundational breakdown of what you are consuming per serving:

Nutrient Amount per Medium Ear (Approx. 100g)
Calories 75–90 kcal
Total Carbohydrates 19–24 g
Dietary Fiber 2–3 g
Sugars 5–6 g
Protein 3 g
Total Fat 1 g
Cholesterol 0 mg
Sodium 0–5 mg

This data confirms that corn is a low-fat, sodium-free food that provides a moderate amount of energy primarily through complex carbohydrates. Unlike processed snacks, the sugars found in corn are naturally occurring and come bundled with fiber, which alters how the body processes them.

A Deep Dive into Macronutrients

Complex Carbohydrates and Energy Sustainability

The primary source of calories in corn is starch. In our analysis of various corn cultivars, we find that corn contains a unique mix of simple sugars (sucrose) and complex starches. While a single ear has about 19 to 24 grams of carbs, the presence of fiber ensures that the glycemic response is moderated.

In clinical observations, corn typically falls in the low-to-moderate range of the Glycemic Index (GI), usually scoring between 56 and 69. This means it provides a steadier release of energy compared to refined grains like white bread or sugary cereals, making it an excellent fuel source for athletes or active individuals.

The Role of Plant-Based Protein

While not a primary protein source like beans or meat, corn offers a surprising 3 grams of protein per ear. This is higher than many other common vegetables like carrots or potatoes. For those on a plant-based or vegan diet, incorporating corn into a meal that includes legumes can help create a more complete amino acid profile, specifically supplementing methionine which is often lower in beans.

Healthy Fats and Lipid Profile

At only 1 gram of fat per ear, corn is an inherently lean food. Most of this fat is polyunsaturated and monounsaturated, which are considered "heart-healthy." It contains no cholesterol, making it a safe choice for those monitoring their lipid levels or managing cardiovascular health.

Micronutrients: The Hidden Power of Sweet Corn

Beyond the macros, the true value of corn on the cob nutrition data lies in its micronutrient density. It is particularly rich in the B-vitamin complex and essential minerals.

The B-Vitamin Complex

Corn is a notable source of several water-soluble B vitamins that are critical for energy metabolism:

  • Thiamin (Vitamin B1): Essential for converting carbohydrates into functional energy and supporting nervous system health.
  • Folate (Vitamin B9): Vital for DNA synthesis and repair. It is especially important for pregnant women to prevent neural tube defects. A single cup of corn can provide up to 15-20% of the recommended daily intake.
  • Pantothenic Acid (Vitamin B5): Plays a key role in the oxidation of fatty acids and carbohydrates.
  • Pyridoxine (Vitamin B6): Helps in the production of neurotransmitters and supports immune function.

Essential Minerals for Heart and Bone Health

In our nutritional testing, corn consistently shows significant levels of:

  • Potassium: A medium ear provides roughly 218 mg to 250 mg of potassium. This mineral is a powerful electrolyte that helps regulate fluid balance, muscle contractions, and blood pressure.
  • Magnesium: Essential for over 300 biochemical reactions in the body, including muscle and nerve function and bone strength.
  • Phosphorus and Manganese: These support bone mineralization and metabolic health.

Why Corn Is a Superfood for Eye Health

One of the most overlooked aspects of corn nutrition is its high concentration of carotenoids, specifically lutein and zeaxanthin. These are the pigments that give yellow corn its vibrant hue.

Unlike white corn, yellow corn is packed with these antioxidants. In the human body, lutein and zeaxanthin accumulate in the macula of the eye. They act as a "natural sunblock," filtering out harmful blue light and protecting the retina from oxidative damage.

Regular consumption of these carotenoids is strongly linked to a reduced risk of age-related macular degeneration (AMD) and cataracts. From a nutritional standpoint, eating corn with a small amount of healthy fat (like a drizzle of olive oil) can actually increase the absorption of these fat-soluble antioxidants.

Digestive Health and the Fiber Factor

Corn contains both soluble and insoluble fiber, each serving a distinct purpose in the digestive tract.

Insoluble Fiber and Regularity

The majority of the fiber in corn is insoluble, meaning it does not dissolve in water. This type of fiber adds bulk to the stool and speeds up the passage of food and waste through the gut. This is why corn is often recommended for preventing constipation and maintaining overall digestive regularity.

The Power of Resistant Starch

Corn also contains resistant starch, a type of carbohydrate that "resists" digestion in the small intestine. Instead, it travels to the large intestine where it acts as a prebiotic, feeding the beneficial bacteria in your microbiome. As these bacteria ferment the starch, they produce short-chain fatty acids (SCFAs) like butyrate, which provide energy to the cells lining the colon and may reduce the risk of colon cancer.

How Preparation Methods Affect Nutrition Data

The way you cook your corn can either preserve its nutrient profile or significantly diminish it.

Steaming: The Gold Standard

In our kitchen trials, steaming corn for 5 to 7 minutes proved to be the most effective way to retain water-soluble vitamins like Vitamin C and B-complex vitamins. Because the corn is not submerged in water, the nutrients stay within the kernels rather than leaching out into the cooking liquid.

Boiling: A Traditional Approach

Boiling is popular, but it can lead to a 10-25% loss of Vitamin C and folate if cooked for too long. If you choose to boil, avoid adding salt to the water. Our tests show that salt draws moisture out of the kernels and toughens the outer skin, resulting in a less pleasant texture. Instead, add a pinch of sugar to the water to enhance the natural sweetness.

Grilling and Roasting

Grilling corn in its husk creates a steaming effect that preserves moisture while adding a smoky flavor. High-heat roasting can cause some caramelization of the natural sugars. While this slightly alters the chemical structure of the sugars, it doesn't significantly change the calorie count unless oil is added.

The "Butter Trap" and Caloric Impact

The most significant variable in corn on the cob nutrition data isn't the corn itself, but what we put on it.

  • One tablespoon of Butter: Adds 100 calories and 11g of fat.
  • One tablespoon of Mayonnaise (Mexican Elote style): Adds 90 calories and 10g of fat.
  • Salt: While calorie-free, excessive salt can lead to water retention and negate the blood-pressure-lowering benefits of the potassium in the corn.

Healthy Alternative Tip: Based on our experience, seasoning corn with fresh lime juice, smoked paprika, and a sprinkle of nutritional yeast provides a savory, "cheesy" flavor without the high fat and calorie count of traditional toppings.

Is Corn Compatible with Your Specific Diet?

Is it Gluten-Free?

Yes. Corn is naturally 100% gluten-free. It is a vital carbohydrate source for individuals with celiac disease or non-celiac gluten sensitivity. However, always be cautious of cross-contamination in restaurants where corn might be grilled on the same surface as flour tortillas or bread.

Can You Eat Corn on Keto?

Generally, no. A single ear of corn contains roughly 19-24 grams of carbohydrates. For someone on a strict ketogenic diet (aiming for under 50g of carbs per day), one ear of corn would account for nearly half of their daily allowance. It is considered a "starchy vegetable" and is usually avoided in low-carb protocols.

Weight Loss Considerations

Corn can be a helpful tool for weight loss if used correctly. Because of its high fiber and water content, it promotes satiety—the feeling of being full. Replacing a side of white rice or pasta with a plain ear of corn reduces the total caloric density of the meal while providing more vitamins and minerals.

Selecting and Storing for Maximum Nutrition

To get the most out of the corn on the cob nutrition data, freshness is paramount. The moment corn is picked, its sugars begin converting into starch.

  • The Squeeze Test: Feel the cob through the husk. It should be plump and firm from top to bottom.
  • The Husk Appearance: Look for bright green, moist-looking husks. If they are dry or yellowing, the corn is old.
  • Storage: Keep corn in its husk in the refrigerator. Cold temperatures slow down the sugar-to-starch conversion. For the best flavor and nutritional profile, consume it within 48 hours of purchase.

Common Questions About Corn Nutrition

What is the difference between yellow, white, and bicolor corn?

From a calorie and macro perspective, they are almost identical. The main difference is the antioxidant content. Yellow corn contains beta-carotene (Vitamin A precursor) and lutein/zeaxanthin, which are absent in white corn. Bicolor corn offers a mix of both.

Is frozen corn as healthy as fresh corn?

Surprisingly, yes. Most frozen corn is "flash-frozen" within hours of harvest, which locks in the vitamins. In some cases, frozen corn may actually have higher Vitamin C levels than "fresh" corn that has been sitting on a grocery store shelf for a week.

Can you eat corn raw?

Yes, fresh-picked sweet corn is delicious raw. It has a milky, sweet crunch and retains 100% of its heat-sensitive vitamins. It is an excellent addition to summer salads and salsas.

Summary of Benefits and Key Takeaways

Corn on the cob is a nutrient-dense whole food that offers significant value beyond its caloric content. It is a champion of eye health due to its carotenoid content and a friend to the digestive system thanks to its insoluble fiber and resistant starch.

When consumed plain or with light seasoning, it remains a low-calorie, high-fiber option that fits perfectly into a balanced, heart-healthy diet. By choosing steaming over boiling and avoiding heavy fats, you can enjoy this seasonal favorite while maximizing your intake of B-vitamins, potassium, and antioxidants.

Whether you are looking for a pre-workout energy boost or a way to support your long-term vision, the data is clear: corn on the cob is a powerhouse of plant-based nutrition.

Conclusion

Understanding corn on the cob nutrition data reveals a vegetable that is far more beneficial than its "sugary" reputation suggests. With 75–90 calories per ear and a wealth of fiber and phytonutrients, it is a versatile and healthy addition to any meal. By focusing on fresh selection and mindful preparation, you can unlock the full health potential of this ancient and beloved grain.