This could be a sign of Hcl or pancreatic enzyme need.
This is a pattern seen in some who eat a large dinner very fast without chewing it properly. This can cause the food to stay in the digestive system for a longer period of time, and in the morning they are still digesting and do not feel hungry.
If this sounds familiar, break this habit by eating a small breakfast, having regular meals throughout the day, and having an early dinner.
Zinc deficiency has been associated with hypochlorhydria (low stomach acid) and this needs to be assessed. A comprehensive stool test is done to assess digestion and gut microbiota.
You may need supplements temporarily to stimulate your digestion. You might want to check with your provider.