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You know when, for whatever reason, you think of a really specific kind of food and start craving it? I've been studying human nature for a while now, and when you put it in that context, it turns out to be a really interesting topic. Going back to our evolutionary days, cravings were essential. It made sure we had all the nutrients and vitamins we need to survive. The human body is designed to recognize all the different things you eat. It pays special attention to this task, just as it does to recognizing subtle body language, or the minute details of spoken word. Suppose you're eating a specific food, let's say a baked potato. Here your body is doing two things at once. Firstly, it takes a mental picture of the food, focusing on everything about it; its taste, its texture, the movements involved in eating it, and of course, how delicious it is. These sensations are saved and memorized, but this is only half the picture. After the food is eaten, your body begins the second phase. During digestion, it is sorted and checked for all its nutritious value. It could have Vitamin C, which helps you live longer. It could have carbs, which give you muscle energy. If your baked potato had butter on it, you have energy which can be stored for future use. All of these things are remembered, and directly associated with the memory of eating the food. So now, you have a complete picture of a baked potato. Whenever your body wants Vitamin C, or carbohydrates, or anything else coming up short in its day-to-day workings, the picture is there, ready for use. It's amazing, a testament to the wonders of evolution. A direct link between our imagination and our basic biology. Some people feel guilty for their cravings. According to the seven deadly sins, it's actually wrong to have these feelings. In its appreciation of the miracle of human life, Proverbs 23:2 proclaims "put a knife to your throat if you are given to gluttony." I don't know about you, but I have the utmost respect for an intelligent force that wants me to stay alive. Cravings can lead to all sorts of interesting situations, and that's why I wanted to start this thread. Yesterday I bought six bottles of sparkling mineral water. I usually have some kind of drink with me throughout the day, but I figured I could use a change from all the sodas and fruit juices I'm used to. So for the last few hours or so since my last meal, I've basically drank nothing but sparkling water. The bottle has been here next to my desk, exactly where a carbonated, sugary soft drink would sit. But a moment ago, something very interesting happened. Just as I was drinking it, I got a sudden craving for golden syrup. Sweet, sugary golden syrup. Weird, huh? But that's exactly it! Sugar is just the thing missing from this water. After all this association between the fizzing CO2 of a pepsi, and the sugar registered in my body, I have combined in my head the cravings for carbonated soft drinks and sugar. My body senses this lack of sugar and, with a suggestive nudge, selects the beautiful image of dessert syrup, something I must've eaten years ago. I just think it's really amazing to see this mechanism working in action, and to marvel at what it can do.