To maintain their shape, all plants contain fibre, whereas no animal contains fibre, with the vast majority and certainly mammals containing a skeleton to maintain their shape.
Therefore, to increase the fibre in your diet you have to eat more plants.
However, the importance of detail comes into play again when choosing products, note the difference in the amount of fibre in these two packets of penne pasta.
One is wholewheat, one is not and the wholewheat penne contains more than 250% more fibre than its refined product.
Fibre is important in our diets for many reasons such as removal of waste products from our gastrointestinal tract and also for feeling of satiation – this is extremely important when weight loss is desired.