Most of us grew up hearing the classic childhood myth: swallow a watermelon seed, and a vine will sprout in your stomach. While we eventually learn that it’s pure fiction, that hasn’t stopped many people from reaching for seedless watermelon at the grocery store.
Some avoid seeded varieties because they dislike the texture of the hard black seeds, while others simply find seedless watermelon more convenient to eat. For many, the goal is to skip the seeds altogether—but is that really necessary?
While certain summer fruits like cherries have seeds or pits that can pose genuine health concerns, does watermelon fall into the same category? What exactly are watermelon seeds—and are they safe to eat?
To help clear up the confusion, we spoke with registered dietitian Samantha Cassetty and Celine Beitchman, Director of Nutrition at the Institute of Culinary Education in New York, to separate fact from fiction about eating watermelon seeds.
Are Watermelon Seeds Safe To Eat?
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Yes, watermelon seeds are completely safe to eat—and they actually offer some impressive nutritional perks. Just one ounce of watermelon seeds packs about 7 to 8 grams of protein, which is roughly the same amount found in an extra-large egg, three ounces of tofu, or half a cup of cooked lentils or edamame.
They also contain 4 grams of carbohydrates and are made up of more than 25% fiber. But the real nutritional value lies in their concentration of essential vitamins and minerals, especially magnesium and iron. An ounce provides 2 milligrams of iron—about 25% of the recommended daily intake for men and 10% for women, according to Celine Beitchman.
“Magnesium plays a key role in over 300 bodily functions, including maintaining a steady heartbeat and managing stress,” explains Samantha Cassetty. “Iron is crucial for energy, helping transport oxygen throughout the body.”
Beitchman adds that watermelon seeds are a smart snack choice for those following a plant-based diet, who may need extra iron, and for pregnant individuals with higher nutritional demands.
What Are The Risks Of Eating Watermelon Seeds?
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As with most foods, moderation is key when it comes to eating watermelon seeds. You can safely enjoy them while eating a slice of watermelon, and they’re even tasty on their own.
In fact, some snack companies now sell roasted and seasoned watermelon seeds, similar to pumpkin seeds, as a crunchy snack or salad topper. Beitchman recommends checking the nutrition label on packaged varieties, especially for sodium levels.
If you’re adding watermelon seeds to your diet for the first time, take it slow. Since most people don’t get enough fiber, eating fiber-rich foods like these seeds may cause temporary digestive discomfort. They’re also fairly high in fat—about 13 grams per ounce—which could also affect digestion if consumed in large amounts.
And no, there’s no need to worry about seeds sprouting in your stomach—our digestive system takes care of that myth. But being mindful of how many you eat can help you avoid any unwanted side effects.
