Since lemons are so high on acid, the acidity level in them greatly stimulate the production of hydrochloric acid. In turn, this helps break down the food in our stomach. Drinking some warm lemon water or squeezing an entire lemon into a cup and drinking it, can help with stomach aches. Lemons increase the amount of HCL produced in our bodies. Once that happens, it helps move digestion properly and at a healthier pace. Also, drinking the lemon water can keep your system running smoothly and flushed.