How to enjoy watermelon without spiking your blood sugar
Get excited because it’s summer-ish and nothing screams summer quite like biting into a cold, juicy slice of watermelon. It’s the fruit of the season. But depending on who you ask, watermelon either belongs on your plate or should be avoided at all costs. So what gives? Why the controversy over such a classic summertime treat?
It all comes down to blood sugar balance. This is where two helpful concepts come in: glycemic index (GI) and glycemic load (GL). The glycemic index measures how quickly a food spikes your blood sugar. On this scale, watermelon scores high, around 80 out of 100 for a 100g serving. That means if you eat it, your blood sugar might rise quickly. Yikes, right?
But wait. The glycemic load is where things get interesting. Glycemic load takes into account how much of that food you’re actually eating. And watermelon’s glycemic load is low. In other words, you’d need to eat a lot of it for that sugar spike to really hit you. That said, watermelon is really easy to overeat. We’ve all had moments of just one more cube until half the bowl is mysteriously gone.
Let’s talk about nutrition. A ⅔ cup serving of watermelon has about 30 calories, 0.6 grams of protein, 0.4 grams of fiber, and 0.2 grams of fat. That’s basically nothing in the protein, fat, or fiber department. It does have 7.6 grams of carbs and 6.2 grams of sugar, so you’re mostly getting simple carbs here. Hence, the sugar conversation. But remember, it’s called watermelon for a reason. This fruit is 92% water, which means hydration is a big win. That water content helps with digestion, energy, and yes, glowing summer skin. Hydration aside, watermelon is actually packing more nutrition than you might think.
Let’s break it down: watermelon gives you vitamin C (hello, immune support), potassium, magnesium, and B vitamins like B1, B5, and B6. It’s also got citrulline, an amino acid that may support circulation and muscle recovery. On top of that, it’s loaded with carotenoids, those are the plant compounds that your body converts into vitamin A, which supports vision, immunity, and skin health. The real star here is lycopene, the antioxidant that gives watermelon its bright red color. Lycopene is known to help fight free radicals, reduce inflammation, and may even offer heart and prostate support.
So watermelon gets a thumbs up, but picking the perfect one? That’s where it gets tricky. You’ve probably seen people knocking on melons at the grocery store, listening for that perfect hollow sound. But here’s a better tip: pick one that feels heavy for its size and has a creamy yellow spot on the side. That yellow spot means it ripened on the ground rather than in a truck. Skip the pale ones and anything with a white cast, that’s a sign it’s underripe. And about the seedless varieties? I’m not a fan. Nothing in nature grows without seeds, so chances are that melon’s been genetically modified. Go old-school and spit out the seeds.
And don’t stop at slices! Watermelon is way more versatile than you might think. Try grilling it on the barbecue (trust me, it caramelizes and gets a little smoky, so good). Toss it in a smoothie with cucumber for a refreshing drink. Or make it the star of a summer salad: think arugula, blueberries, crumbled feta, and a handful of nuts. It’s sweet, salty, crunchy, and hydrating all in one bite.
Watermelon is a great way to eat seasonally, stay hydrated, and add some extra vitamins to your day. Just keep that blood sugar conversation in mind. Think of watermelon as part of the bigger picture, how it fits with the rest of your meals, your fiber, your protein, and everything else on your plate. With that approach, watermelon totally earns its spot on the summer menu.