High-fat intake is important because they will be pulling sleds that weigh about 250 lbs. Together the two factors cause their human bodies to burn a lot of calories to power itself and to keep itself warm. They have to keep replenishing their fat stores so they do not burn muscle. Both explorers will gain approximately 15 extra pounds before they go on the Expedition to increase their fat reserves. Shouldn't we all be so lucky.
Liquids are important to decrease the risk of hypothermia.
Antarctica is more arid than the Sahara and quickly whisks moisture away from the human body. To avoid dehydration, which can ultimately lead to frostbite, it is very important for Ann and Liv to drink plenty of water. As Ann and Liv have aged, their cravings for certain food items have decreased. Neither can explain why this happened. One thing they both crave, however, is fat.