Elevated levels of the hormone homocysteine, a by-product of protein digestion and metabolism, have been linked to age-related diseases such as heart disease and Alzheimer's. Research shows that by reducing our consumption of acidic protein foods, such as meat, we may be able to reduce and control our homoçysteine levels. Studies have also shown that the B vitamins B6, aB12, niacin, and folate can help lower levels of homocysteine in the blood. A study published in the journal Neurological Research found that blood cells in the brain were heavily damaged by a slightly acidic state (6.6 pH). The researchers believe that acidity may play an important role in the development of dementia and Alzheimer's disease.