Suppose you are taking part in a research study assessing the biochemical consequences of only eating one type of biomolecule: carbohydrates, fats or proteins

Suppose you are taking part in a research study assessing the biochemical consequences of only eating one type of biomolecule: carbohydrates, fats or proteins. The duration of the study is six months.
Which one would you pick? Pick one (carbohydrates, fats or proteins) and rationalize your answer using the information on metabolism. What are the metabolic or physiological issues that could arise from being on that diet, due to eating too much of that one biomolecule and also not enough of the other biomolecules?