URGH! The reading isn't even the same as 断る, how frustrating. To Cut Off is read as たつ. Instead of eating too many chocolates and getting cut off, maybe you're eating too many tater tots (たつ). Don't eat so many of those, it's unhealthy. You have to cut off tater tots from your diet so you don't get fat.
Take into account that you don’t know what you could do while you’re drunk, so you should really cut yourself off from drinking alcohol.