
Staying hydrated is important, as our bodies are made up of roughly two-thirds water. While drinking water is essential, eating water-rich foods can also help us maintain healthy hydration levels. Mushrooms, for example, are made up of about 92% water, making them a great option to boost hydration.
| Characteristics | Values |
|---|---|
| Water content | 92% |
| Nutritional benefits | Good source of vitamin B2 (riboflavin) |
| Vitamin B2 benefits | Important for skin and nervous system, reduces tiredness, releases energy from food |
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What You'll Learn

Mushrooms are 92% water
Yellow melons, such as honeydew, are another hydrating food, with a water content of around 91%. They are also low in calories and sugar and a good source of potassium, which helps keep blood pressure, nerves, and muscles healthy. Broccoli florets are also a good choice, with a water content of about 90%. They also contain important nutrients like vitamins K and A, iron, calcium, and folic acid.
Mushrooms are not just a good source of water, though. They are also a good source of vitamin B2 (riboflavin), which is important for the health of your skin and nervous system. Vitamin B2 also helps reduce tiredness and releases energy from the food you eat. So, if you want to stay hydrated and get some extra vitamins, consider adding some mushrooms to your next meal!
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Health benefits of vitamin B2
Mushrooms are mostly made up of water. For example, the water content of a raw common mushroom is 23.5g per 10g edible portion.
Vitamin B2, also known as riboflavin, is a B-complex vitamin that is important for a healthy metabolism and for maintaining body tissues. It is naturally present in some foods and is also available as a dietary supplement. Here are some of the health benefits of vitamin B2:
Supports Growth and Development
Vitamin B2 helps your body create energy from the food you eat and supports the function of your cells. It does this by helping turn carbohydrates and proteins into fuel for your body.
May Help Prevent Migraines
Some research suggests that vitamin B2 may help prevent migraines in both adults and children. One study found that people who took 400 milligrams of vitamin B2 every day for three months experienced a reduction in migraines compared to those who took a placebo.
May Reduce the Risk of Cancer
Some experts believe that riboflavin may help prevent cancer by stopping cancer-causing substances called carcinogens from damaging cells.
May Improve Eye Health
Vitamin B2 may also help prevent cataracts, although further studies are needed to confirm this.
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Water content of different mushrooms
Water content is a critical factor in mushroom cultivation, influencing growth, yield, and quality. The ideal water content varies depending on the mushroom species and the type of substrate used. Proper hydration throughout the cultivation process is essential for producing healthy mushrooms.
Oyster mushrooms, for example, prefer higher moisture levels, typically thriving in substrates with around 60% moisture. In contrast, Shiitake mushrooms often do well with slightly lower moisture levels of 50-55%. Button mushrooms usually require moisture levels ranging from 55-60% in composted manure substrates.
The substrate material also plays a role in water retention. Straw, for instance, retains moisture well and is suitable for high-humidity environments. On the other hand, sawdust dries out faster and may need more frequent watering.
Temperature is another factor that affects water content. Higher temperatures increase evaporation, leading to reduced moisture levels, while lower temperatures can result in excessive moisture retention, creating conditions favourable for contamination.
Maintaining optimal water content is crucial during the different stages of mushroom development, from spawning to pinning to fruiting. Each stage may require slight adjustments in moisture levels to ensure optimal growth.
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Mushrooms as a food ingredient
Mushrooms are a versatile ingredient that can enhance the taste, texture, and nutritional profile of various dishes. They are composed of approximately 92% water, making them a water-rich food that can contribute to hydration. Here are some ways in which mushrooms can be incorporated into your meals:
- Oven-baked Portobello Mushrooms: Fill large Portobello mushroom caps with chopped tomatoes and a sprinkle of low-fat cheese. Bake them in the oven for a tasty and healthy alternative to pizza. This dish offers a rich, meaty flavour while being vegetarian-friendly.
- Addition to Savoury Dishes: Mushrooms can be chopped and added to a variety of savoury dishes, including Bolognese, chilli, soups, stews, and casseroles. They blend well with other ingredients and add a savoury, umami flavour to the dish.
- Vitamin B2 Source: Mushrooms are a good source of vitamin B2 (riboflavin), which is essential for maintaining healthy skin and a well-functioning nervous system. Vitamin B2 also helps reduce tiredness and releases energy from the food you consume.
- Nutritional Benefits: In addition to their high water content, mushrooms provide other important nutrients. They contain vitamin B2, as mentioned, and are also a source of potassium, which is crucial for maintaining healthy blood pressure and supporting nerve and muscle function.
When incorporating mushrooms as a food ingredient, it's important to consider the variety of mushrooms available and their varying properties. Some mushrooms have higher water content than others, and certain varieties may offer distinct flavours or textures that suit specific dishes. For example, Portobello mushrooms are known for their large caps and meaty texture, making them ideal for oven-baked dishes or vegetarian replacements for meat. Other varieties, such as button mushrooms or shiitake mushrooms, may have slightly different flavours and textures that complement certain recipes.
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Other water-rich foods
Mushrooms are composed of approximately 92% water. Cremini, portabella, and white button mushrooms have the highest water content among the many varieties of mushrooms. They are also a good source of vitamin B2, which is essential for skin health and the nervous system.
Cucumbers have the highest water content of any food, at around 96%. They are low in calories and a good source of vitamins and fibre.
Tomatoes are composed of about 95% water. They are a good source of vitamin A, which is important for skin, eye, and immune health.
Yellow melons, such as honeydew, have a water content of around 91%. Melons are low in calories and sugar and are a good source of potassium, which helps regulate blood pressure and nerve and muscle function.
Oranges contain about 86% water. They are a good source of vitamin C, an antioxidant that supports muscle, bone, tendon, artery, and skin health, as well as immune and nervous system function.
Apples are composed of roughly 86% water, and different varieties may have slightly different percentages. Apples are a good source of fibre, potassium, B-complex vitamins, and vitamin C.
Blueberries are about 85% water. They are a source of fibre, vitamins, minerals, and antioxidants, which help protect cells from damage.
Celery is high in fibre and vitamins A, C, and K. It is a low-calorie food that can aid in weight loss and is easy to incorporate into your diet.
Green bell peppers contain 94% water, while orange bell peppers have slightly less water at 92% but provide more vitamin C.
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Frequently asked questions
Yes, mushrooms are made up of roughly 92% water.
Mushrooms are a good source of vitamin B2 (riboflavin), which is important for skin health and the nervous system. Vitamin B2 also helps to reduce tiredness and releases energy from food.
Mushrooms are versatile and can be added to dishes like Bolognese, chillis, soups, stews, and casseroles. They can also be stuffed and baked in the oven for a pizza alternative.
Other water-rich foods include spinach (93% water), yellow melons (91% water), broccoli (90% water), cucumbers (96% water), and oranges (86% water). These foods can help increase your fluid intake and keep you hydrated.

























