Make sure you have clothing that will not lose its insulating properties when wet. Dehydration is a predisposing condition for frostbite and hypothermia. Eat plenty of food, especially carbohydrates, which are quick to digest and easy for your metabolism to turn into heat. Eat small amounts frequently rather than large amounts infrequently. Set a reasonable pace when engaging in vigorous activities.
Exhaustion can make treatment and even recognition of frostbite more difficult.
Pack a small camp stove, along with fuel and at least one pot, in case another injury is involved and you can't move the frostbitten person. You may have to prepare warm liquids for him or her. If your feet or hands feel cold, it may be the first step on a journey to frostbite. Stop and rewarm them before they go numb. Avoid alcohol, which could contribute to dehydration and impair judgment, as well as caffeine and nicotine, which constrict blood vessels and therefore reduce the blood supply to extremities.