Oil is essentially fats. Fats are not necessarily bad. Some fats are healthy fats and are good for you.
What happens when you eat them, is your body excretes a couple compounds, like enzymes and bile, to break down the fat in your intestines. Then, your body absorbs those stuff.
I’m not sure what your dietitian means by “little volume oil takes up” in your system. If you eat a tablespoon of oil, until broken down and absorbed, its going to take up that much volume.
Fat isn’t inherently unhealthy. Some fats are. Some aren’t.
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