Wednesday & Saturday - partial fast
Friday - fast and abstinence
partial fast = meat with just one meal (the main meal)
partial OR full fast = 1 full meal, 2 smaller meals, no snacking between meals, no alcohol
Abstinence - children 7 or older
Fasting - adults 18-60, who aren't sick, pregnant or nursing, must fast.
(I think the post-Vatican II Church changed the fasting minimum age to 18 -- it used to be 21. I suppose we should go along with this, since it's actually more strict.)