I agree that supplements help too. My supplements of choice for flat toned abs are: chia seeds, multi-vitamin with greens and wellness supplement to help my body handle stress which is a major reason people store fat in the belly area. I also use organic whey protein powder and coconut fat.
A clean diet, daily workouts, plus a few supplements and the right type of ab workout can flatten your abs in 4-8 weeks! Check out my Corset Training Core Ab Workout
if you need a good ab workout. This workout trains your natural corset muscles (the transversus abdominis) for flat abs, a smaller waist, plus it burns belly fat too.