I want to know what are the prohibited foods in Islam. Is coca cola, Pepsi, Sprite, and 7 up, all Haram in Islam?

Praise be to Allah, the Lord of the World; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.

There is no harm in using soft drinks if they do not contain any substance that causes drunkenness even if the quantity of such material is very little. Because, there is a Hadith that reads: "If a big quantity of anything causes drunkenness, its small quantity is also forbidden" . [al-Musnad and al-Sunan].
Also, everything that can cause harms to one's body is also prohibited.
Allah knows best.