A rustic brown bowl holds tender golden potatoes sprinkled with fresh herbs
Vegetables

Does a Cold Potato Have Fewer Calories Than a Hot One?

A cold potato does not suddenly lose a large number of calories after a night in the refrigerator. Cooling changes part of its starch structure, which can reduce how completely some of that starch is digested in the small intestine. So a cold potato may provide slightly less metabolizable energy than the same potato served […]

Wilbur O. Atwater, an antique calorimeter, and foods rich in fat illustrating the scientific origins of the 9 calories per gram rule.
Calorie Basics

Who Decided That a Gram of Fat Has 9 Calories?

Older food labels offer an interesting record of how nutrition numbers and labeling rules have changed. One number has stayed remarkably familiar: a gram of fat is counted as 9 calories. We wanted to trace that familiar figure back to the original research and find out how it became the standard. The answer leads back […]

Overhead view of a glass bottle of olive oil surrounded by green and black olives, olive branches, and small bowls of golden olive oil.
Calorie Basics

Calories in Olive Oil, From a Measured Tablespoon to a Free Pour

Olive oil takes up very little space in a pan, while its calorie contribution can be substantial. A tablespoon of olive oil weighs about 13.5 grams and provides roughly 119 calories, according to USDA food-composition data. That gives us a useful reference point for calories in olive oil, as long as we know how much […]

Two freshly baked russet potatoes split open
Calorie Basics

How Many Calories Are in a Baked Potato Before the Butter and Sour Cream Go On?

For a plain medium russet, calories in a baked potato come to about 164 before butter, sour cream, or another topping goes on. The USDA-based value used for a 173-gram baked russet with skin is about 95 calories per 100 grams. USDA FoodData Central is the primary database behind many of the nutrition entries you […]

A shopper compares calorie information on two food packages in a US supermarket.
Calorie Basics

Is a Kcal the Same as a Calorie, or Is the Label Off by a Thousand?

A Reddit discussion about a cat-food pouch labeled 13 kcal offers a useful example of a common unit mix-up. A kilocalorie contains 1,000 small scientific calories, but 13 kcal does not mean 13,000 food Calories. Here is the distinction that matters: in nutrition, 1 kcal and 1 Calorie represent the same amount of food energy. […]

Bowl of whole almonds next to a Nutrition Facts label showing 170 calories per 28-gram serving, with a question mark highlighting calorie accuracy.
Calorie Basics

Do Almonds Have Fewer Calories Than the Label Says?

A calorie figure can come from direct measurement or from a calculation based on standard factors. That distinction matters especially for almonds, where food structure can affect how much energy the body absorbs. The calorie count on almond labels may not reflect how much energy your body actually absorbs. So do almonds have fewer calories […]

Halved sweet potatoes on a wooden cutting board with fresh rosemary, seasonings, and olive oil.
Vegetables

How Many Calories Are in a Sweet Potato, and What the Thanksgiving Casserole Adds

The USDA entry for baked sweet potato gives a clear starting figure: 90 calories per 100 grams. Compare that with a Thanksgiving casserole recipe, and the calculation changes quickly. So how many calories in sweet potato are there? A sweet potato baked in its skin without salt has about 90 calories per 100 grams, and […]

Close-up of freshly harvested orange carrots with green leafy tops, showing their natural texture and roots.
Calorie Basics

How Many Calories Are in a Carrot, and Does Cooking Change the Number?

Raw carrots contain about 41 calories per 100 grams, which puts a medium 61-gram carrot at roughly 25 calories. Boiled and drained carrots come in at about 35 calories per 100 grams. Cooking can change the number you see because water content and final weight change, not because heat simply removes calories. So how many […]

Spaghetti squash and a bowl of pasta displayed side by side with a sign showing question marks for calories, illustrating a comparison of whether spaghetti squash can be a lower-calorie pasta substitute.
Vegetables

How Many Calories in Spaghetti Squash, and Can It Really Replace Pasta?

Spaghetti squash has one quality that almost sells itself. Once it is baked or cooked, the inside separates with a fork into long strands that look a lot like spaghetti. That is where the name comes from, along with the comparison to pasta that appears almost everywhere people talk about this vegetable. The calorie difference […]

Butternut squash and white potatoes shown side by side for a simple visual comparison.
Vegetables

Does Butternut Squash Really Have Half the Calories of a Potato?

Butternut squash and potatoes often end up in the same place on the plate. Both can be roasted in cubes or served as a warm side dish, so comparing their calories makes a lot of sense. The numbers floating around online can look a little dramatic, though. One of the more common claims says that […]