He very well could be trying to sabotage your business because he feels threatened. You've lost weight, and are becoming successful. Two very scary things to a man who is insecure. If you are also spending less quality time with him since these 2 things have come about, he could feel like his marriage is in jeopardy, and the only way to get you "back" is to sabotage you. Take an honest look at your marriage, and ask yourself it you've put him on the back burner.
On the flip side, he could just be acting like a thoughtless bonehead, without any ulterior motives. It could be that he doesn't realize this business is important to you, and considers it to be just a hobby that you'll get tired of.
I would sit him down and talk about this, calmly, and find out which it is. If he feels threatened, take steps to make sure he knows that success and confidence are a wonderful thing for your marriage, and not a threat. If he's just being thoughtless, call him on it.