Do dairy and gluten products cause or enhance hereditary hairloss?

Dairy and gluten products do not cause hereditary hair loss. Genes cause hereditary hair loss.  For men, this hereditary hair loss occurs in a pattern.  That is why they call it Male "Pattern" Balding (MPB).

No, there is no scientific proof to date that gluten can directly impact AGA. Of course, if someone has celiac disease (the disease that comes with being gluten sensitive), it's possible to have poor absorption and low iron. This can lead to shedding (telogen effluvium) not genetic hair loss. There is no scientific proof that dairy consumption can impact AGA. You may be read some information lately about alopecia areata (see link below). That is a different condition and gluten may have a role (mostly in children who prove to have celiac disease)

There is no direct evidence I know of dairy or gluten causing hair loss.  In general, hereditary hair loss is precipitated by genetic factors but can also be influence by other unidentified factors.  Gluten and dairy have not been identified, but a healthy diet fueling your cells with plenty of antioxidants is never a bad idea.  If you continue to have hair loss, remember that the sooner you intervene the more likely you are going to have success in treatments.