The one thing that actually causes weight loss is: caloric intake < caloric expended So you need to either intake fewer calories or increase expenditure of cal

The one thing that actually causes weight loss is: caloric intake < caloric expended So you need to either intake fewer calories or increase expenditure of calories. For the best outcome do both. One easy way to increase caloric use is to dirnk ice water. Your body has to heat it up to body temperature which takes a not insignificant amount of energy. As mentioned in other posts, walking is a low impact activity that is an easy way to expend more calories. Be careful experimenting with oxygen ratios, you can die in a pure oxygen environment.