I am convinced that chemo, radiation, or both, do affect glandular function throughout the body. In my own case, two factors stand out. A once over-oily skin is now excessively dry. My mouth is always dry which indicates that salivary glands are not functioning properly. Doubtless, other glandular functions may be, and probably are, likewise adversely affected.
Loss of appetite is also a characteristic side effect of radiation in particular.
I forced myself to eat at normal intervals, in the process permanently changing my diet. I forced myself to eat foods which I particularly like, including fresh fruits, bananas in particular, canned fruits, eggs, cheese and vegetables. Meets were forced only as to those which were favorites of mine, but in small quantities. I've experienced a lessening of appetite on other occasions, though none were so severe. The pattern established in forced eating has permanently altered my diet.