Hello, thanks for contacting HCM with your question.
From the description of his symptoms of shaky feeling, faintness
few hours after eating does indicate that he may have hypoglycemia
or insulin sensitivity. In response to food , pancreas
insulin and this brings the blood sugar down until his next meal. This
could be a pre-diabetic stage and your father needs to have HbA1C
fasting and two hour post meal blood sugar levels tested. Rarely ,insulinoma
) can do this. I agree with you that he should have
more protein in the diet and cut back on concentrated sugar products.
Wish him the best.