I will say that instant ramen is not healthy and is not harmful to you at the same time. The biggest cons for instant noodles is the possibility of containing preservatives used to extend shelf life. They are TBHQ and MSG, which could influence your health in the wrong way in case you eat instant noodles at least two times a day every day.
Other cons of instant noodles are the same as many fast foods have. It is the lack of some vitamins and minerals, and the significant amount of sodium.
But at the same time, instant ramen has Iron, Riboflavin, Manganese, vitamin B, and other nutrients.
According to a comparison of food and nutrient intake between instant noodle consumers and non-instant noodle consumers in Korean adults, those who ate instant noodles on a daily basis had a lower intake of vitamins A and C, protein, phosphorus, and some other nutrients.
But from my point of view, the lack of different nutrients you can redress by eating fruits and vegetables.
So the main idea here is the same as for all other consumption. You should keep the right balance. Overeating of anything can cause problems with your health. So please, be responsible.