Heartburn and indigestion are caused by excess acid in the stomach, but this acidity is not harmful to human beings, but it is useful because it protects human beings from deadly diseases such as food poisoning.
Scientists say that poisoning is caused by germs in the stomach and the acid in the stomach kills these germs. Experts tested the acidity of 68 species of animals.
The report says that the reason why animals have more acid in their stomachs is that they eat rotten food but still survive and since eating rotten food also increases the risk of poisoning. Animals are also protected from this, because of the high acidity in their stomachs.
Dr. D’Anna Beasley, a professor at North Carolina State University, says that in the early stages of human evolution when humans ate carcasses, they were protected from poisoning by the same acid.
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