Is there a significant downside to a diet in which the total fat consumed each day is 2 grams but you get all the nutrition such as carbs proteins vitamins minerals you need each day?

you really can just see how it works with your body for 4-8 weeks. If there are no changes, you might want to consider the calories you are taking in. Also, the carbs in your body (many of them) turn to sugar. This is what is stored instead of fat. So, there is good fat for you that you may want to eat and drink in place of some of the carbs. :) hope this helps