Why Is Too Much Watermelon Not Good for You? Side Effects

3 Common side effects of watermelon include:

• May cause digestive trouble: Watermelon contains lycopene, which when consumed every day can lead to nausea, loose stools, heartburn, and inflammation.
• May raise blood sugar levels: Watermelon has natural sugars and a high glycemic index, meaning people with diabetes should be mindful of how much watermelon they consume. It is also better to avoid juicing watermelon as this can remove the fiber content, making the sugar easier for the body to absorb, which as a result may increase glucose levels in the body.
• May cause allergic reactions: In rare cases, some people may be allergic to watermelon and experience reactions such as hives, swelling, and trouble breathing. In severe cases, an allergic reaction may lead to anaphylaxis, which can be life-threatening.

Watermelon is about 91% water and 7.5% carbs, which means that you can eat a decent amount with very little calorie intake. 

Nutrients in 2/3 cup (100 grams) of raw watermelon are as follows:

• Calories: 30
• Water: 91%
• Protein: 0.6 grams
• Carbs: 7.6 grams
• Sugar: 6.2 grams
• Fiber: 0.4 grams
• Fat: 0.2 grams

When eaten in moderation, watermelon can be good for your health including:

• Helps with hydration: Watermelon is made up of mostly water and contains a good amount of electrolytes that can help you stay hydrated. Adequate hydration is essential to all of your body functions.
• Helps manage blood sugar levels: Watermelon helps your kidneys convert L-citrulline into L-arginine, which is an amino acid that is vital for regulating glucose metabolism and insulin.
• Keeps your heart healthy: The high lycopene content of watermelon helps protect cells from damage and may lower blood pressure and reduce the risk of heart diseases. 
• Fights inflammation: Lycopene acts as an inhibitor for various inflammatory processes and helps fight free radical damage, both of which contribute to conditions such as arthritis and cancer. 
• Good for nerve function: Watermelon is a rich source of potassium and choline, which help regulate nerve function and facilitate electrical impulses more effectively. This can then help improve muscle movement, learning, and memory.