You can get more fiber in your diet by eating fiber - rich foods such as oats, fruits, veggies, and, perhaps most importantly, legumes. (fitnessandpower.com)
Everyone needs more fiber in their diet so this is a great way to add it in without having to choke down bran flakes! (thefashionablehousewife.com)
It seems totally fine to eat those whole foods, as more fiber in the diet might really help your dad. (nutritionfacts.org)