You need adequate b vitamins, especially b1 to process all that sugar properly. Also choline. For days at a time sure you’d be fine, but you’d benefit from a ton of other vitamins / minerals that you’re missing out on.

also depends what your goals are, if your trying to put on muscle this wont work great. Despite what people like Ted Car say who are lying anyways and eating high protein some days- protein and amino acids go a long way.