It depends on the person really. If you take ina lot of oats yes this can really cause constipation. Oat absorb liquid such as water.
Water is very important in a healthy bowel movement because stools absorb water and make it much easier to pass. Although oats are a very good complex carbohydrate, try experimenting by removing oats from your diet and slowly add them back in to see if this maybe the problem and see how much your digestive system can handle hope this helps.
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