Those foods are the ones that are high in Fiber!
Fiber is the part of plant foods that that your body doesn't digest and absorb.
There are two basic types of fiber: soluble and insoluble. Both are good, so you really don't have to "memorize" which is which; however, insoluble fiber adds bulk to your stool and can help prevent constipation - a great reason to be sure your daily diet is fiber-rich! Vegetables, some fruits, wheat bran, barley, brown rice and other whole grains are good sources of insoluble fiber.
Soluble fiber may help improve your cholesterol and blood sugar levels. Whole oats, dried beans, and some fruits like apples and oranges, are good sources of soluble fiber. So yes, there is some truth to "an apple (unpeeled) a day keeps the doctor away!
By now you've probably noticed that these are carbohydrate foods! And you're right! These are the "good carbs" that you want to fill 3/4 of your plate with!
In fact, the only problem with fiber is that most of us don't get enough! Man or woman, make 25 grams or more of all fiber your daily goal. Starting the day with a whole grain cereal will help. The Uncle Sam's brand has almost 10 grams of fiber per serving; that's about as high as you can get in boxed cereals. Then making sure you have vegetables, beans, seeds and whole grains during the rest of the day should help you meet your goal. You really need to label-read to see if you are getting 25 grams of fiber in your usual day.
Fiber is the friend of anyone who is curbing calories to lose weight because most of the high-fiber foods are not only low in calories, but really help you feel full and satisfied so you don't get hungry so quickly and won't tend to want a "sugar fix". That's because these high-fiber foods are digested slowly and don't cause a spike and fall in your blood sugar level.
And for those who need more fiber in order to fight a tendency towards constipation, most people can safely take over-the-counter store-brand fiber capsules as a supplement. In fact, fiber supplements can aid in our digestive issues like gas, bloating and diarrhea (that is not illness-based). The usual dosage is up to 6 capsules to start with a full glass of water when you get up in the morning. You can start with 3 and build up to six if you want. Sounds like a lot, but most people find they adapt to the schedule pretty quickly - and appreciate the benefits.
To read more about the benefits of living the high-fiber life, click here.