Fugi, you've got a point there. Abnegation may satisfy some people but if you get stressed because of it your metabolism will suffer, nullifying your efforts.
That said, keep on eating/drinking what you enjoy, only reducing the portions. The trick is to spend the same time despite the smaller amount. Concentrate to every chew, mouthful, sip as it were your last chance to taste it. Be a connoisseur, a gourmand! Instead of pouring a bucketful at once into your throat, sniff it, look at it, taste it in tiny bits, feel what you're eating and drinking.
This reminds me of my childhood, when yoghurt was a rare delicacy in our family. I sometimes ate it with a fork to make it last longer. Try chopsticks, especially with soups they really would make you work for your nourishment...