The first line of digestion occurs in the mouth, where the saliva/chewing help to break down food into chyme paste, where it can them be swallowed.
There might be an issue with not enough saliva. One sign might be cracked lips or at corners of mouth..
There are some reasons for reduced saliva:
Not enough vit A,
an increased metabolism,
smoking inside the household,
being on prescription medications.
Giving lemon juice or honey before a meal can increase saliva. You can try that and see if it helps.
Magnesium is a common deficiency. It is hard to find a body system not affected by a magnesium deficiency and it includes the nervous and digestive system. Lack of appetite, vomiting, agression (as some have said) unstable blood sugar levels,headaches, and more are magnesium deficiency symptoms. Salmon, baked halibut, and brocoli are good sources, as is Dimagnesium Malate, which is a chelated form that the body can use because it is recongnized as food. Another option is Fluvic acid (not folic acid)which has magnesium in it, in an ionic form that can easily pass to cell membranes. It also had 60 other trace minerals in it. I highly recommend it. It is a fairly tasteless liquid, which makes it easy to give. You can find it online or at the health food store.
Another thought is, there could be a food allergy. My nephew threw/spit up alot when he ate. By the time he was 4, they FINALLY narrowed it down. A food allergy to apples, and another food I can't remember right now. Glossitis, (a swollen tounge) can contribute to not being able to swallow, and can be caused by food allery, dehydration, or vitamin deficiencies like Vit B/E/Zinc/Iron.
It could be due to not being able to chew:
fungal infection in the mouth (white tounge),
tonsilitis, ulcers, infections, glossitis.
I would consider starting to look for a medical reason for this. Online searches might help. If symptoms persist, and you get nowhere with a standard medical doctor consider someone who might think outside the box. Dr Graeme Shaw in Los Altos ###-###-#### uses western and eastern approaches, and standard and natural methods. There is another doctor in Redwood City, his name is in my file, and still another in concord ,John Toth ,###-###-#### that you could call and see if they can help you. I haven't used any of them but they are specialists in chronic illness, and they think outside the box.
Keep looking for answers, ask God for knowledge, direction and insight, he gives it to all who ask. God bless you,
Gail