Please also read:
Penance and Mortification
Gluttony, And Why it is One of the Seven Deadly Sins
Since, as Catholics, we know that we must fast for forty days (actually thirty-six since we do not fast on the Sundays) in Lent, and since we know that it is an incredibly solemn matter which cannot be lightly put aside without the loss of salvation, it behooves us, then, to get good at fasting, rather than waiting until the appointed time and hope that we can make it. After all, with practice we improve, and perfect practice makes perfect and perfectly practicing the works of perfection make us perfect at being perfect. And lest you think I'm only joking around, did God himself not say: "Be you therefore perfect, as also your heavenly Father is perfect"?