Question: How many customers have cancelled orders? | Do you mean the customers in the previous result? | yes
SQL: SELECT count ( T1.customer_name )  FROM customers AS T1 JOIN orders AS T2 JOIN order_items AS T3 JOIN products AS T4 ON T1.customer_id  =  T2.customer_id AND T2.order_id  =  T3.order_id AND T3.product_id  =  T4.product_id WHERE T3.order_item_status  =  "Cancel" AND T4.product_name  =  "food"