Staying hydrated is one of the simplest ways to support your body, but plain water isn't the only source. Dietitians often point to high-water foods—especially fruits and vegetables—as a dual-purpose tool. They help meet fluid needs while delivering nutrients that can calm the nervous system. Here are six evidence-backed foods that do both, according to nutrition experts.
1. Cucumber
Cucumbers are more than 95% water by weight, making them one of the most hydrating foods you can eat. They also contain B vitamins and magnesium, two nutrients that help regulate stress responses. A small study in the Journal of Nutrition found that adequate magnesium intake is associated with lower levels of cortisol, the primary stress hormone. Toss sliced cucumber into salads, infuse it in water, or eat it with hummus for a crisp, cooling snack.
2. Watermelon
Watermelon lives up to its name—it's roughly 92% water. Beyond hydration, it provides lycopene, an antioxidant that may reduce inflammation linked to chronic stress. The fruit also contains citrulline, an amino acid that supports blood flow and cardiovascular health. Dietitians recommend eating it plain or blending it into a smoothie without added sugar. Because of its natural sweetness, it can also curb a craving for sugary treats.
3. Celery
Celery is another water-dense vegetable (about 95% water) that offers a subtle crunch and a low calorie count. It is a source of potassium and silica, which help maintain electrolyte balance and reduce tension in blood vessels. Some research suggests that the phthalides in celery may lower blood pressure by relaxing artery walls—a benefit for anyone feeling frazzled. Try it with almond butter or in a cold soup like gazpacho.
4. Strawberries
Strawberries contain around 91% water and are rich in vitamin C. Vitamin C is used by the adrenal glands during stress and can help blunt the rise of cortisol after a stressful event. A study published in the Journal of Clinical & Diagnostic Research noted that vitamin C supplementation reduced anxiety levels in students. While whole strawberries are best, frozen ones also retain their nutrient profile. Add them to overnight oats or eat them as a hydrating dessert.
5. Zucchini
Zucchini (courgette) is roughly 94% water and a good source of manganese and vitamin B6. Manganese supports antioxidant defenses, while vitamin B6 is involved in neurotransmitter production—including serotonin, which helps regulate mood. A review in Nutrients highlighted that low B6 levels are linked to higher perceived stress. Grate zucchini into salads, roast it with olive oil, or spiralize it as a low-carb pasta alternative.
6. Coconut water (from young coconuts)
While not a solid food, coconut water is often grouped with high-water foods by dietitians because of its electrolyte profile. It provides potassium, magnesium, and sodium in a natural ratio that supports rehydration after exercise or heat exposure. Some preliminary research suggests that its potassium content may help lower mild blood pressure elevations triggered by stress. Choose unsweetened coconut water without added flavors for the most benefit.
Why high-water foods matter for stress
When you are dehydrated, even mildly, your body produces more cortisol. A study from the Journal of Psychophysiology found that a 1.5% loss of body water was enough to impair mood and increase feelings of tension. By eating foods that naturally contain water, you help maintain fluid balance without having to think about it. The added vitamins, minerals, and antioxidants in these foods also directly support the adrenal and nervous systems.
How to combine them for best results
Dietitians suggest aiming for at least two servings of high-water produce at each meal. A simple example: start the day with a smoothie made from spinach, cucumber, and frozen strawberries; have a side of celery with lunch; and snack on watermelon in the afternoon. Each choice supports both hydration and a calmer stress response.
Editor's note: While these foods can support general wellness, they are not a substitute for medical treatment. If you experience chronic stress or dehydration symptoms, consult a healthcare provider.
