Never had a lab but yes they're unquestionably the dustbins of the dog world. Cocker Spaniels a surprising 2nd or 3rd apparently , noses that can smell food - or drugs - a mile off! Our last one had a terrible cocaine habit...
Ours have always had dry with fresh chicken, carrots, broccoli added to each meal just to liven it up. Also mix in a boiled egg or give scrambled egg once a week. You can also buy these great veg mash frozen cubes which they love especially in hot weather. But runner beans, courgette, sweet...