If you work out twice as long at a low intensity, you may burn more fat than at high intensity, but you'll use approximately the same number of calories. To lose a pound of body fat, you have to burn 3,500 more calories than is needed to maintain your current weight. There's also less chance of injury. But it's not a better way to lose weight than more intense workouts. Psyllium is primarily soluble fiber and comes from a grain.
People take it as a bulk-forming laxative, or to try to lower blood cholesterol.
It's a mild and effective laxative. Large amounts of fiber can affect nutrient absorption, and some early studies found that high doses of psyllium can interfere with the absorption of certain minerals. But recent research has found that a standard psyllium dose taken immediately before mealtime has no significant effect on vitamins or minerals. The research suggests that any small effect moderate amounts of fiber may have on nutrients is not a worry, especially if your intake of nutrients is adequate. It is better, however, to get fiber from food than from a powder or pills, since fiber-rich foods are very nutritious.