Denying oneself - my thought is man uses fasting as a way of denying himself. Not wrong but not commanded.
Arguments:
1. Fasting that pleases Yahweh
Isaiah 58:6-7 Is not this the kind of fasting I have chosen: to loose the chains of injustice and untie the cords of the yoke, to set the oppressed free and break every yoke? Is it not to share your food with the hungry and to provide the poor wanderer with shelter - when you see the naked, to clothe him, and not to turn away from your own flesh and blood?
2. Israelites were to present sin offerings on the day of atonement and sin offerings were to be eaten
a. Numbers 29:11 Include one male goat as a sin offering, in addition to the sin offering for atonement and the regular burnt offering with its grain offering, and their drink offerings.
b. Leviticus 6:24-29 The Lord said to Moses, "Say to Aaron and his sons: 'These are the regulations for the sin offering: The sin offering is to be slaughtered before the Lord in the place he burnt offering is slaughtered, it is most holy. The priest who offers it shall eat it, it is to be eaten in a holy place, in the courtyard of the Tent of Meeting. Whatever touches any of the flesh will become holy, and if any of the blood is spattered on a garment, you must wash it in a holy place. The clay pot the meat is cooked in must be broken; but if it is cooked in a bronze pot, the pot is to be scoured and rinsed with water. Any male in a priest's family may eat it, it is most holy.