I should probably refer you to my daughters, because they, like you, are much more attentive to their sons' diets
than i was to theirs.
However, i did teach, "eat when you're hungry; stop when you're full." introduce a variety of legumes (peas) & other vegetables early & model good food choices yourself at sit-down family meals. Avoid "fast"& pre-packaged foods, random snacking & sugary drinks.
...Do you have a follow-up question? Consult Dr. Fricke, a
Pediatric Developmental and Behavioral Specialist
with 40 years in practice: