crisp crispbread diet dietary fiber fiber-rich fibre flax seed flaxseed grain hard bread healthy linseed low calorie reduce weight seed seeds sesame starvation sunflower seed abstract appearance backdrop background baked biscuits bread-substitute brown colors colours crispy crunchy dietary-biscuits dietary-substitute dieting dry edge edges edible food hard on-edge plain sandwich-substitute surface texture textured textures weight-reduction multi-grain multi-grained surfaces