My farts are very smelly! I mean exceptionally. Any advise?

Avoid certain foods. Eating a healthy diet can cause gas due to excess fiber. Since humans don't digest the fiber, intestinal bacteria will eat it and make gas as a byproduct. "beano" enzyme may help. Another reason is lactose intolerance, in which one can't digest lactose (milk sugar). "lactaid" tablets help. A third reason is sugar alcohols, like maltitol, that can cause gas. The doctor can search for other causes.