Colin Oldham, 63, is acutely aware that the high-carb content of beer can contribute to weight gain. After all, he farms 60 acres of hop vines in Motueka. Hops are the key ingredient in beer. “I had put on some weight - the middle-age spread - and decided to do something about it.” What’s ironic is he started taking Calocurb, an appetite-suppressing dietary supplement made from the hop flowers he grows. Since he started taking the pills daily a year ago, he has lost seven kilograms.