Research shows that eating a fiber-rich diet might be linked with a reduced risk of depression, especially in premenopausal women.

There is insoluble fiber, which are things like whole grains, beans, nuts and certain vegetables and fruits. Secondly, there is soluble fiber, which includes things like vegetables, citrus fruits and oats. It can be confusing because most foods are actually a combination of soluble and insoluble fibers, so talk to your doctor, dietitian or nutritionist for clarification.

Refined processed foods such as white bread and pasta are lower in fiber. These foods are linked to a higher risk of health problems such as obesity, cancer, depression and high blood pressure.

Some patients may need to follow a low-fiber diet after bowel surgery, or if they have a condition such as Crohn's disease or ulcerative colitis. A low-fiber diet contains foods that don't create much waste, giving your bowels a break.

While fiber is great for your gut, it could slow down your exercise routine. Too much fiber before a workout may make you feel bloated or nauseous. Also, because high-fiber foods take longer to digest, more blood will be flowing to your gastrointestinal tract to aid digestion, instead of going to your muscles.