http://www.herbs-info.com/blog/top-10-amazing-health-benefits-of-watermelon/?c=d
1. Highly alkalising – the pH balance of the body is regarded as crucial for good health, eating watermelon helps to counteract harmful acidity levels that are produced by many common foods in the western diet. [1]
2. Reduces high blood pressure – Several studies have found benefits from watermelon to the cardiovascular system. A 2012 study found that watermelon extract supplementation (6g per day for 6 weeks) reduced ankle blood pressure and carotid augmentation index in obese adults with prehypertension or hypertension. [2] A 2014 study found that watermelon may provide cardioprotection by reducing aortic blood pressure in obese adults with hypertension. [3]
3. Reduces heart disease – Recent research shows clear signs that watermelon can reduce arteriosclerosis in animals. As a rich source of citrulline, it makes sense that it may also reduce arterial plaque in humans. High levels of potassium also contribute to a healthy heart. Consumption of watermelon juice has been found to increase plasma concentrations of lycopene and beta-carotene and numerous scientific studies have already shown lycopene good for the cardiovascular health. [4] [5]
4. Reduces blood sugar – Great news for diabetes sufferers! Watermelon is included in the list of plants and foods that can help to lower blood glucose levels, simulating the effect of insulin in the body. [6]
5. High water content – Fully ripe watermelons contain over 90% water, perfect to quench your thirst on a hot day! More than that, water-rich foods are regarded as being especially beneficial for overall health as dehydration causes adverse conditions in the body.
6. Boosts immune system – High levels of vitamin C and A will give your immune system a valuable boost. Lycopene and beta-carotene also help to remove free radicals that cause cell damage. [7] [5]
7. Strengthens bones – Lycopene is generally accepted as being beneficial for bone health so it makes a good remedy to help combat degenerative bone diseases such as osteoporosis. [8]
9. Cleans Kidneys – The high concentration of citrulline, which is converted by the body into arginine, has positive implications for urinary system health [9] and the high water content also assists here.
10. Anti Cancer – Studies have indicated that the antioxidant lycopene, which gives watermelons their characteristic red colour, may have supplementary benefits in the treatment and prevention of prostate and other cancers. Lycopene is noted for its ability to combat free radicals that trigger the onset and development of many chronic degenerative diseases like cancer. The seeds also contain triterpenes that can help to inhibit the growth of leukaemia cells. Interestingly, lycopene is also present in tomatoes and is thought to be one of the reasons for the overall healthfulness of the mediterranean diet. [10][11]
Note that it may be important to be somewhat moderate in the consumption of fruits due to their sugar content – watermelon has low sucrose levels but is quite high in fructose. Also for best results, only eat organic fruit and avoid pesticide toxicity.
References:
[1] http://alkaline-alkaline.com/ph_food_chart.html
[2] http://www.ncbi.nlm.nih.gov/pubmed/22402472
[3] http://www.ncbi.nlm.nih.gov/pubmed/24572702
[4] http://www.jnutbio.com/article/S0955-2863%2812%2900154-4/abstract
[5] http://www.ncbi.nlm.nih.gov/pubmed/12672916
[6] http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3609288/
[7] http://www.ncbi.nlm.nih.gov/pubmed/24877107
[8] http://www.alive.com/articles/view/22059/lycopene_bone_health
[9] http://link.springer.com/article/10.1007%2Fs10545-005-0467-1
[10] http://www.ncbi.nlm.nih.gov/pubmed/24354176
[11] http://www.ncbi.nlm.nih.gov/pubmed/24851879
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