(2) Vegetables contain a lot of vitamins and inorganic salts. Vitamin C mainly comes from vegetables. Eating less vegetables will lead to vitamin C deficiency, which will lead to scurvy. Li Ming often feels weak and dizzy recently. This is a symptom of anemia. Anemia is caused by too few red blood cells or too low hemoglobin content. The doctor advised him to pay attention to reasonable nutrition. So it may be caused by the low hemoglobin content. Hemoglobin is a red iron protein with iron and protein.

Protein began to be digested in the body in the stomach, initially digested into peptides under the action of gastric juice, and finally digested into amino acids under the action of intestinal juice and pancreatic juice after entering the small intestine.

So the answer is:

(1) Yes; No;

(2) scurvy;

(3) iron deficiency anemia;

(4) gastric juice, intestinal juice and pancreatic juice.