How many allergies does the food allergy type have?
select count ( allergy ) from allergy_type where allergytype = 'food'
How many allergies does the animal allergy type have?
select count ( allergy ) from allergy_type where allergytype = 'animal'
How many allergies does the environmental allergy type have?
select count ( allergy ) from allergy_type where allergytype = 'environmental'