The human body needs alkaline forming foods to balance the body's acid levels. According to Trans 4 Mind, the human blood needs pH levels around 7.35 to 7.45 for optimal health and levels that are above or below the optimal pH levels are a sign of bad health. Levels above 7 on the pH chart are alkaline, while levels below 7 are acidic. Adding more alkaline foods to a diet will prevent diseases and problems relating to acid production in the stomach after eating.
Spinach is a high alkaline forming food option. The key to the higher levels of alkalinity in spinach is to eat raw spinach rather than cooked spinach. When cooked, the spinach is less alkaline, in fact it can become acidic when cooked. While cooking will make it less alkaline, it is still a food with high alkaline levels. One ounce of raw spinach has about 8% alkalinity. When cooked, spinach is on the line between acidity and alkaline, usually ending up around 1% acidic.
According to the crohns.net website, which gives information about healthy lifestyle and diet for anyone including those with Crohn's Disease, figs are a very high alkaline forming food. In fact, one ounce of figs is charted as having a potential for 30% alkalinity. It is one of the highest potential alkaline forming foods available, which makes it ideal for anyone with high acid levels or that needs more alkaline forming foods in their diet.
Olives of any kind are high in alkalinity. One ounce of olives, whether green or ripe, has about 16% alkalinity. The high alkalinity found in olives transfers into olive oils as well as the olives, so olive oil also has high alkaline levels.
While grapefruit is a fruit that is high in citric acid, it is also an alkaline forming food. According to Connective Tissue Disorder Site, or CTDS, citrus fruits have a high level of acidity before they are consumed, but they become alkaline forming foods after they are metabolised. They also leave alkaline behind. Grapefruit has an alkalinity of 1.7% per one ounce.