Has the plant based diet been worth it?

Today my husband had his doctor's appointment.  We were both commenting that if his numbers didn't show an improvement we were going to be really ripped!  It isn't easy to eat the way we've been trying, though it is getting better - we are slowly finding things that we like, and know better how to do this, but it still would be a major kick in the pants if it wasn't making any improvement in measurable health numbers.  I won't pretend to know what the numbers mean....I just haven't taken the time to study it out.  But I do know that numbers going up is bad and going down is good.  Dave's weight is down almost 20 lbs, his blood pressure went down 20 points on the top number and down 10 points on the bottom number.  His diabetes number dropped 1 full point, and his cholesterol dropped 50 points. The doctor said he'd never seen numbers drop that much in 3 months, which is how long it's been since his previous appointment.  We've been following this diet for 2 months.  Jury is in....we'll keep doing this.