Of course you can do a semi fast. Do what ever works for you to improve your health. Every little bit helps. My work is also demanding and I cannot easily fast. I do use what I call cleansing drinks, and (usually) try to eat a healthy diet. While some people may not appreciate your efforts or not want you posting on this forum; remember, you are doing this for you, not for public approval. Do all you can to help yourself keep or regain your best possible health. There is a General fasting forum and a Fasting for weight loss forum that might prove helpful to you.