There is a saying that goes, " we are what we eat. " In fact, if people take a deeper look at the food being consumed, only then will the person realize that a lot of it are unhealthy which is why most people are obese.
The reason is because the most of these are acidic or have a high concentration of alkaline in it. Some examples of acidic foods are peanuts, meat, sugar, beans and legumes. Those that contain alkaline are certain vegetables, fruits and juices.
The types of beverages available also has high concentrations of acid. Coke and beer for example has a pH2 while coffee that has caffeine is a pH 4.