No, not really.

Per my gastroenterologist and people I’ve know who study this stuff… Fiber kind fills the nooks and crannies of your intestines and provides a food for the bacteria in your gut. The “good” bacteria in your gut happen to thrive on fiber.

Beta blockers work by blocking receptors in your heart muscle that sense certain hormones (namely adrenaline) in your blood, thus making your heart less sensitive to them. The hormones being blocked make your heart pump harder and faster. Because they are blocked, your heart beats slower and less hard.

In the case of beta blockers, your body being less sensitive to adrenaline has the effect of relieving physical signs of stress. This can to a calming effect for some people.

Edit: made this comment shorty after waking up, fixed a major typo.