Oxygen causes oxidation which is the converting of nutrients into energy. This oxidation also helps eliminate toxins and waste. The greatest threat to oxygen intake is the deterioration our breathing system. Next comes our exercise and nutrition, and then the environment. Of course if you are in a highly toxic present time breathing environment you will want to make it a priority above all others.
Junk foods deplete oxygen stores.
Both emotional and physical stress create very high oxygen loss. Most stress is partially or completely neutralized by any one of several key breathing exercises . Another way to increase available oxygen is to eat fewer acid forming food. Of course these are the everyday foods of the American public. They include most junk foods, all carbonated beverages, most soft drinks, all alcoholic beverages, the majority of grains and breads and meat.