How many Yelp_Business in Anthem are under the category of "Food"?
in Anthem refers to city = 'Anthem'; the category of "Food" refers to category_name = 'Food'
SELECT COUNT(T3.business_id) FROM Categories AS T1 INNER JOIN Business_Categories AS T2 ON T1.category_id = T2.category_id INNER JOIN Business AS T3 ON T2.business_id = T3.business_id WHERE T1.category_name LIKE 'Food' AND T3.city LIKE 'Anthem'