one way degassing valve knows with the development of technology, increasing juice is combined with chemical ingredients and food flavor in the market, they are inevitable added to coffee.
It is hard to say how many natural materials are really used into the food and drinks we are taking. But we all know that the food processed repeatedly is not healthy at all.
Despite of the convenience and low price of instant coffee, it is not suggested to drink it for keeping you fit.
Instant coffee generally is made by the sleazy Robusta, the disadvantage of this coffee bean is that its aroma is not rich and the amount of caffine is high. That's why so many merchants add a lot of seasoning like sugar, essence and additive. The most common one is the industrial product called creamer. Creamer will produce trans-fatty acid, damages the health of the people take it too much.
So I appeal you staying away from the unhealthy drinks. Even if you are busy with your job, you need to take care of yourself better to drink healthily. You can relish a cup of real healthy black coffee in a coffee shop or make coffee at home if your financial condition is permitted.