Chronic constipation can lead to colon cancer.
Constipation is often due to side effects from medication as well as an unhealthy diet with insufficient fiber.
Most people don't eat enough fiber.
Wheat bran, wheat germ, macro cereal gentle fibre, oat bran, linseed, Psyllium seeds, Chia seeds and Psyllium husks are all very high fiber foods and there is also a lot of fiber in fruit and vegetables.
Both constipation and IBS as well as diarrhea can often be cured with liquid chlorophyll as in a web search for "liquid chlorophyll" + constipation + ibs.
Other natural ways to relieve constipation are covered in a web search for "natural ways to relieve constipation".
Red meat can take up to 72 hours to go through the system so you are probably better off without it.
Cheese in large amounts can cause constipation as well.