When people compare healthy foods, they usually look at what's inside them. They compare calories, fibre , vitamins , minerals, or sugar. If two foods have similar nutrition, it's easy to assume they'll have a similar effect on your appetite. But that's not always the case. Sometimes, two foods with nearly the same nutrients can leave you feeling very different after eating them. The hidden reason has less to do with what's in the food and more to do with the form it comes in. An Orange Shows Why Take an orange. Eating a whole orange takes a little work. You peel away the skin, separate the segments, and chew each bite before swallowing. The fruit stays intact, so eating it naturally takes time. Now think about a glass of orange juice. The peeling, squeezing, and breaking down have already been done. Instead of eating the fruit one segment at a time, you can drink it in a matter of seconds. It's still an orange. Many of the nutrients are still there....