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Before I started paying attention to food labels, and indeed before most foods in Japan had full nutritional data, I used to think that the relative sweetness or composition of a food related to caloric values. That is, if it wasn't very sweet, didn't have frosting or a fatty filling, I figured that it couldn't carry much of a punch on the calorie front. Back in those naive days, the cake you see pictured above was one of my favorite treats. It's a mildly sweet, moist, vanilla cake which is about the size of your palm.
Fast forward to the present and my rather greatly enhanced knowledge of all things food and more comprehensive food labeling. I discovered that my favorite unassuming steam cake is about 470 calories. That's as much as I consume for entire meals. People think Japanese folks don't get fat because their sweets aren't as sweet, but that really does not relate to how fattening the snacks are. Take that from someone who has been paying close attention for the last several years - your hips are not safe merely because the food isn't as sweet.