I don't always get to start my day with lemon juice in water, but try to squeeze some in during the day, here's an article that tells why it's a good idea...
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Citric acid can also play a very important role in chelating out abnormal calcium stones. It has a unique ability to form soluble complexes with calcium that many have used to eliminate pancreatic stones and kidney stones. This mechanism can also help prevent calcium deposits from building up in the arteries that promote cardiovascular disease.
Clean water with lemon provides the body with hydration, anti-oxidants and electrolytes. Lemon is a rich source of the immune boosting vitamin C. It also has good quantities of electrolytes such as potassium, calcium and magnesium. Lemon is a tremendous source of citrus bioflavonoid anti-oxidant phytonutrients that have been given the label Vitamin P.
Vitamin P consists of the flavonoid glycosides hesperetin and naringenin among others. Studies have shown that vitamin P enhances the anti-oxidant capability of vitamin C. These bioflavonoids also improve capillary permeability and overall blood flow. This is especially important for oxygenating tissues and maintaining normal blood pressure. These anti-oxidants have also been shown to reduce swelling, venous backup and edema.