Standard Definition

Hydrating foods are foods and prepared dishes that contribute water to total intake. Fruit, vegetables, yogurt, and broth-based soups can supplement beverages during an ordinary day, but they are not a treatment for dehydration or significant fluid loss.

Default Use

Include water-rich foods as part of meals and snacks when they fit the meal. Use beverages as the primary, adjustable source of fluid when heat, activity, illness, or other conditions increase needs.

Examples of Water-Rich Foods

The table uses rounded USDA FoodData Central values for the named raw food form. Water content varies with variety, ripeness, preparation, and product formulation.

Food and defined form	Approximate water by weight	Practical meal use
Cucumber, with peel, raw	95%	Slice for salads, sandwiches, or snacks
Iceberg lettuce, raw	96%	Use as a salad or sandwich base
Zucchini, raw	95%	Add raw to salads or cook as a vegetable
Tomato, red, ripe, raw	95%	Add to meals, salads, or snacks
Watermelon, raw	92%	Serve with a meal or snack
Strawberries, raw	91%	Add to meals, snacks, or yogurt
Orange, raw	87%	Serve as whole fruit with a meal or snack

These percentages describe the food’s composition by weight; they are not a hydration score or a fluid prescription. Milk, yogurt, smoothies, and broth-based soups also contribute water, but their water and electrolyte content varies by product or recipe.

Why This Works

Water from foods is absorbed through the gastrointestinal tract and contributes to total water intake. Food also supplies carbohydrate, protein, minerals, and other nutrients, depending on what is eaten.

The amount of sodium, potassium, and other electrolytes varies widely by food and preparation. Water-rich foods should therefore be treated as supportive meal components, not as a predictable electrolyte-replacement dose.

When This Matters

Water-rich foods can be useful when they make eating and drinking easier, such as during hot weather or when appetite is reduced. When illness causes vomiting, diarrhea, fever, or difficulty maintaining intake, choose fluids and medical guidance according to the severity and cause rather than relying on food alone.

Limitations

Hydrating foods do not replace a standardized oral rehydration solution or medical evaluation when losses are substantial. Seek prompt clinical guidance for persistent vomiting or diarrhea, inability to keep fluids down, confusion, fainting, severe weakness, very little urination, or worsening symptoms. People with a prescribed fluid, sodium, potassium, or carbohydrate restriction should follow their individualized plan.

Practical Use

Use water-rich foods to complement beverages:

• add fruit or yogurt to a meal or snack;
• include vegetables in meals;
• use broth-based soup as a light meal when it is tolerated;
• increase direct fluids when heat, activity, or illness increases losses.

Put This Into Practice

Add one water-rich food to a meal or snack when it improves the meal. Treat it as part of total intake, not as proof that fluid needs have been met. Use thirst, intake, conditions, and relevant clinical guidance together rather than relying on one symptom or urine color alone.

Evidence and Scope

The table reports rounded values from USDA FoodData Central for the defined raw food forms; values can vary by variety, ripeness, and preparation. USDA FoodData Central is the source for food-water and nutrient composition. Clinical dehydration and oral rehydration require separate assessment and should not be inferred from a food-water percentage.

• USDA FoodData Central
• CDC Travelers’ Diarrhea guidance

Connects To

Bottom Line

Water-rich foods contribute to total fluid intake and can complement beverages, but they do not treat dehydration or confirm that fluid and electrolyte needs have been met.