The Scientific Distinction: Seed, Fruit, and Vegetable
Botanically, classifications are based on plant anatomy and function.
What is a Fruit?
A fruit is the matured ovary of a flowering plant that protects and disperses seeds. This includes items often used in savory dishes like tomatoes, cucumbers, squash (including pumpkins and zucchini), peppers, and eggplants, all of which contain seeds.
What is a Seed?
A seed is a ripened ovule containing an embryo. A seed is never botanically a fruit, but rather is contained within a fruit. Seeds like peas and beans are eaten, sometimes with their fruit (pods). Others, such as sunflower or pumpkin seeds, are removed from the fruit before eating.
What is a Vegetable?
Botanically, "vegetable" is not a formal term but refers to any other edible plant part. This includes roots, stems, leaves, and flowers. Botanical vegetables do not contain seeds.
The Culinary Confusion: Taste and Tradition
Culinary classification is based on flavor and use, often leading to items that are botanically fruits being treated as vegetables. For instance, the U.S. Supreme Court ruled in Nix v. Hedden (1893) that tomatoes were vegetables for tariff purposes due to how they were served.
How seeds fit in culinarily
Some seeds like pumpkin or chia are eaten alone and are often grouped with nuts. Other seeds, such as peas or beans, are key parts of dishes considered vegetable-based.
Seeds in your diet
Nutritionally, seeds are frequently included in the "Protein Foods Group" with nuts and legumes due to their protein, healthy fats, and fiber content, differing from fruit and vegetable classifications based on other nutrient profiles.
Botanical vs. Culinary Classification Table
| Food Item | Botanical Classification | Culinary Classification | Contains Seeds? | 
|---|---|---|---|
| Tomato | Fruit (Berry) | Vegetable | Yes | 
| Cucumber | Fruit (Pepo) | Vegetable | Yes | 
| Pumpkin | Fruit (Pepo) | Vegetable | Yes | 
| Peas | Seed of a Fruit (Legume) | Vegetable | Yes (the pea itself) | 
| Carrot | Vegetable (Root) | Vegetable | No | 
| Spinach | Vegetable (Leaf) | Vegetable | No | 
A Final Word on Your Dietary Choices
Botanical versus culinary labels don't change the nutritional value of plant foods. The key is eating a wide variety of produce. Enjoy the health benefits of all edible plant parts, regardless of their classification. For more nutritional guidance, the MyPlate website is a valuable resource.