Nutritional factors are integrally linked with Alzheimer's disease (AD). Al
though AD patients have no changes in energy metabolism, fluctuations in we
ight are fairly common. The potential role of vitamin B-12 and folate, with
the production of hyperhomocysteinemia, in the pathophysiology of AD is ex
plored. The role of free-radical damage in AD is discussed. It is stressed
that alterations in dietary lipids may play an important role in cognitive
defects in AD secondary to their effects on neuronal membrane lipids. More
research is needed on the role of nutrition in the ongoing development of c
ognitive changes in AD.