As of late I stopped eating bread (even ezekial sprouted grain bread) and am noticing sinemet lasting longer .....4 hours +. Also have slowly dropped a couple of pounds . Tis indeed a sacrifice to give up the rye toast in the mornings, pizza and artisan bread but carrying it around in my gut for days has tipped the scale in favor of giving it up. Brown rice pasta is better than wheat pasta imho and I have a yummy recipe for a curry quinoa salad if anyone is interested. I don't know for sure whether its the change in diet ( I'm also eating strawberries from my garden in the mornings ) that is extending the "on" time but its definitely helped reduce the tire round my belly -and i still get my ice cream....