Lemons

Prevents Kidney Stones

Lemon, both from the fresh fruit and from juice concentrates, has more citric acid content than grapefruit juice and orange juice. This is confirmed through a study by Dr.  Stephen Nakada, President-Elect of the American Board of Urology. Another study confirmed that the high citric acid content in the fruit help increase urinary citrate levels more than 2-fold without changing total urinary volume. Thus, lemonade therapy can be used as a secondary therapy for treatment of hypocitraturic calcium nephrolithiasis (urinary stones formed due to low citrate consumption). Studies conducted at the American Urological Association highlight the fact that lemonade or the juice can eliminate the occurrence of kidney stones by forming urinary citrate, which prevents the formation of crystals.

https://www.ncbi.nlm.nih.gov/pubmed/18290732/?&utm_medium=1399

https://www.ncbi.nlm.nih.gov/pubmed/8709360/?&utm_medium=1399

Benefit Your Skin

Lemon juice contains powerful compounds that can give your skin a better complexion and reduce the chances of having acne.

Lemon juice has an antibacterial effect and can be used to cleanse your skin from pimple-forming bacteria. In one study, cleansing the skin with lemon juice resulted in fewer acne pimples. Researchers mixed 4 parts water with 6 parts pure lemon juice to create a skin cleanser. This was enough to help prevent more spots from forming.

Can Help You Lose Weight

Some people say that lemon can burn fat. Whether that is true or not, drinking a glass of natural lemon juice every day can certainly help you lose weight faster.
Plant chemicals found in lemons have an anti-obesity effect when used in studies using rats. Scientists noticed that polyphenols in lemon seemed to suppress appetite and also boost liver metabolism. The result was that the chemical compounds helped to limit body weight gain and prevent fat accumulating.  
It is difficult to know if these chemicals in lemons would have a similar fat-reducing effect in humans. However, a randomized controlled trial on humans found that taking lemon peel powder did help to control fat accumulation and improve metabolism. The researchers found that lemon peel extract had a positive effect in reducing obesity.

Lemon water can help to lose weight by increasing your fluid intake which can help to reduce appetite. Also, swapping healthy lemon juice drinks for sugary sodas will help to reduce your calorie intake.