Usually, a multiple preservative system, and /or the incorporation of hurdle technology, is needed to accomplish this goal. Preservatives should be effective at low concentrations in order to reduce costs, minimize toxicity effects, and not adversely affect the physical properties of the finished product.
Flax is full of fibre and is rich in omega-3 fatty acids. Carrots alone won't make you go to the bathroom. Full of fibre, raw carrots that are part of a healthy fibre-filled diet can improve your stool movement. Remember, eat them raw. Cooked carrots can lead to constipation. Beans, beans, the musical fruit.
Oatmeal and bran cereal will provide your kid lots of fibre. Whole grains are packed with protein and fiber that are good food for constipation in children and good for your body especially your digestive system. You can add whole grains by eating brown rice instead of white, whole wheat bread instead of white, and eating whole grain pasta instead of white.