It is very difficult to answer this question, because no one wants to take a clear position on the subject. However, several studies suggest that aluminum may be a contributing factor to Alzheimer’s disease.
Knowing that an aluminum anode dissolves over time, it is normal to conclude that aluminum particles will end up in your hot water. Even if you do not consume the hot water directly, you are in contact with it when you take a bath or a shower.
Very often, plumber offer to change magnesium anode for an aluminium anode in order to try to fix the rotten egg smell in the hot water. You should know that better solution exists such as Corro-Protec Powered anode rod.