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A cup of diced watermelon (about 152 grams) contains roughly 46 calories, making it one of the lowest-calorie fruits available.

A standard tablespoon of regular mayonnaise contains roughly 94 calories, placing it among the most calorie-dense condiments in a typical kitchen.

Turkey calories vary by cut; a 3-ounce serving of roasted skinless breast has about 125 calories, while the same amount of dark meat has about 175.

A whole mango (336 grams) contains about 201 calories, while one cup of diced mango (165 grams) has approximately 99 calories.

A medium-sized raw tomato (about 123 grams) contains approximately 22 calories, making tomatoes one of the lowest-calorie whole foods you can add.

A standard one-cup serving of mac and cheese typically contains 300 to 500 calories, though homemade recipes often range higher.

Lettuce contains roughly 5 to 10 calories per cup serving, depending on the variety, making it one of the lowest-calorie vegetables you can eat.

A medium baked sweet potato contains approximately 100 to 114 calories, depending on its size and cooking method.

A standard half-cup serving of regular vanilla ice cream averages about 137 calories, though premium brands and larger portions can change.

A standard slice of commercial white bread has about 69 calories, while whole wheat comes in closer to 82 calories per slice.