First of all, the concept of "nutrition" is very vague in English.

Generally speaking, using Healthy to express this kind of food is good for human body, while using Unhealthy to express it is not good for human body.

If this kind of food is rich in substances beneficial to human body, it can be said that it is nutritious. But in general, it is not used, and the most commonly used ones are Healthy or Good For Sb.