Fiber may be the most underrated part of a healthy diet. It keeps you regular, supports the good bacteria in your gut, and lowers the risk of several digestive problems, yet most people get only about half of what they need. As a gastroenterologist, adjusting fiber is one of the first things I talk about with patients. Here is why it matters, how much you need, and how to get more without the bloating that can come from doing it too fast.
What Fiber Does
Fiber is the part of plant foods your body cannot digest. Instead of being absorbed, it moves through the gut and does several helpful jobs: it adds bulk and softness to stool, feeds the healthy bacteria in your colon, helps control blood sugar and cholesterol, and helps you feel full. For digestion specifically, it is the key to comfortable, regular bowel movements.
The Two Types of Fiber
- Soluble fiber dissolves in water and forms a gel. It softens stool and helps with both constipation and diarrhea. Found in oats, beans, apples, citrus, and psyllium.
- Insoluble fiber adds bulk and helps move things along. Found in whole grains, nuts, and the skins of fruits and vegetables.
Most whole plant foods have both, so a varied diet naturally gives you a good mix.
How Much You Need
A common target is about 25 grams a day for women and 38 grams a day for men, or roughly 14 grams for every 1,000 calories. Most adults get only around 15 grams. Closing that gap is one of the simplest upgrades you can make for your gut.
The Best Sources
- Beans, lentils, and chickpeas, among the richest sources
- Whole grains like oats, brown rice, and whole-wheat bread
- Fruits such as raspberries, pears, and apples with the skin
- Vegetables, especially broccoli, carrots, and leafy greens
- Nuts and seeds, including chia and flax
Whole foods are better than supplements for most people, though a supplement like psyllium can help fill a gap. Our high-fiber diet plan has more detail.
How to Add Fiber Without Bloating
Adding too much fiber too quickly is the main reason people get gas and bloating and then give up. Instead:
- Increase it gradually over a few weeks
- Drink more water as you add fiber, since fiber needs fluid to work
- Spread it across meals rather than all at once
- Stay active, which helps the gut move
When Fiber Is Not the Whole Answer
Fiber helps most people, but not every gut problem. Those with IBS sometimes react to certain high-fiber, high-FODMAP foods and do better with a tailored approach like the low-FODMAP diet. If more fiber makes your symptoms worse, or you have ongoing digestive trouble, a gastroenterologist can help you find the right plan.
Talk to a Gastroenterologist in Mountainside, NJ
If your symptoms keep coming back or you are not sure what is causing them, Dr. Amber Khan can help. We see patients from across Union County and New Jersey.