If you get roughly 8 glass of water including the water in the foods you eat you are unlikely to get dehydrated. Essentially you have to drink enough water to replace the water you urinate and loss through sweat to remain satisfactorily hydrated.
Only a small percentage of rice is soluble fiber. Most of rice is composed of very easy to digests carbohydrates. A small percentage - less than 5% - is a resistant starch that acts like a soluble fiber which is indigestible and travels undigested to the colon. However, unlike insoluble fiber it does not absorb water. Soluble fiber dissolves in water to form a gel that is why it is called soluble fiber because it is soluble in water.
Could you simply be experiencing the gastrocolic reflex? Heather has an explanation of it on this web page. Basically what happens is when food leaves the stomach and starts entering the small intestine about 30-60 minutes after you eat it cause contractions in the colon producing the feelings of gassy and bloating felt by those with IBS. It may not have anything to do with food you eat but simply the act of eating. It happens to me frequently. What happens when you eat rice with a small amount of insoluble fiber from veggies?
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Re: Soluble fiber and hydration
What happens when you eat rice with a small amount of insoluble fiber from veggies?
