I'm not a nutrition expert but I know for a fact something simple about lemons:
When you think you have a stomach ache
- because you allegedly have "too much acid", it's actually the opposite: your stomach does not have enough acid.
- Result: food goes undigested and harmful bacterial flora are allowed to thrive, and other bad things beyond the scope of this post.
- Remedy: drink at least four glasses of water a day with the juice of 2 lemons, plus another four glasses with no juice. Spread it out throughout the day.
When you think your bones are aching, or your muscles are sore
- or you are moving slow for whatever reason. you may have slightly too much acid in your blood stream. The body is pretty awesome at keeping your Ph tightly controlled between 7.35 and 7.45. It has multiple systems to do so which are beyond the scope of this post. A Ph Below 7 is called acidosis and you can die, and above 8 is called alkalosis and you can die. Each major number is an order of scale, like earthquakes, 8 being 10 times more alkaline than 7.
- Result: you feel crappy
- Remedy: same as above with the lemons. Why? Turns out going into your body, lemons are acidic, which is great for your stomach as mentioned above. But then, once your stomach converts all of the lemons' minerals and amino acids into other useful items (some sugars, some free ions, some other compounds, etc), the lemons actually have the effect of being alkaline to the rest of your body.
Two cures for the price of one.