Often with a diet too much of anything is bad for you and it becomes an issue of balance. You want certain proportions of certain vitamins. This can vary on what activities you do, your genetics, enviroment etc.
So you have to balance it with many things, there is some leeway here of course and your body can cope with many abuses.
Another issue is what form you take something in. Taking refined sugar is much stronger as it is pure. Drinking juices which are in smoothie form are better than pure juice because of the way the smoothie contains bits helps the body to process the drink. With soy it’s more healthy to eat the fermented products though the non fermented products can be minimally good too well depending where you get them from and what your body can take.
The interesting thing is the idea of too much of anything can be applied to life generally too.