How do a start a fasting diet?

A Muslim keeps away from from some things that God has allowed for them, namely eating, drinking, and intercourse between husband and wife. However, if someone is sick, nursing, or traveling they are exempt from fasting. Also, during the day of fasting, the Muslim is obligated to keep themselves away from that which is not permissible. Otherwise, if they only keep themselves from that which is permitted (eating, drinking, and sexual intercourse between the husband and the wife) then they are only starving themselves. So a Muslim, during the day of fast must keep close from some of that which is Halaal (permissible) and stay away from that which is haram (forbidden) in order to gain piety.