Foods have different pH if analyzed on their own, compared to the pH of our urine when they are processed by the body. On their own, milk and water are close to neutral, vinegar, lemon, tomatoes are on the acidic side, and eggs are slightly alkaline. However, lemon and tomatoes can lead you to produce a slightly alkaline urine. There is some evidence of vegetarians having urine on the alkaline side, and people eating more meat, cheese, fish, grains and processed foods having a more acidic urine. That is why they say that fruits and vegetables are alkaline and animal, processed foods are acidic. However, there is no clear information about how the pH may change with different amounts and combinations of foods, and even the relevance of eating an alkaline diet is unknown.