An activity involving physical exertion and skill that is governed by a set of rules or customs and often undertaken competitively. b. often sports (used with a sing. verb) Such activities considered as a group: Sports is a good way for children to get exercise.
Rust is Iron Oxide. Hence, any warnings concerning the ingestion of iron may apply. Ingesting too much iron, whether it be via rust, suppliments, or otherwise, can lead to unpleasant symptoms including nausea and vomiting. Long-term side affects such as liver damage can be associated with excessive iron intake.
Rust is caused by a Oxidation reaction, where Oxygen reacts with the metal to form a compound. For example, Rust can be formed when Iron reacts with Oxygen to form Iron Oxide, over time this will show the qualities of Rust. You've already answered you're question on how to prevent Oxidation.