question: How many states or District of Columbia have 65.4% overweight or obese adults?
answer: SELECT COUNT(state_and_district_of_columbia) FROM table_18958648_1 WHERE overweight__incl_obese__adults = "65.4%"
context: CREATE TABLE table_18958648_1 (state_and_district_of_columbia VARCHAR, overweight__incl_obese__adults VARCHAR)