The only time that they were somewhat hungry was with the Shoshonis in the mountains. One of the most famous journal entries of the expedition was when they killed a deer with the Shoshonis while the Shoshonis were starving. Entry from August 16, 1805:

I sent Drewyer and Shields before this morning in order to kill some meat as neither the Indians nor ourselves had any thing to eat. I informed the Ceif of my view in this measure, and requested that he would keep his young men wih us lest by their hooping and noise they should allarm the game and we should get nothing to eat, but so strongly were there suspicions exited by this measure that two parties of discovery immediately set out one on ech side of the valley to watch the hunters as I beleive to see whether they had not been sent to give information of their approach to an enemy that they still preswaided themselves were lying in wait for them. I saw that any further effort to prevent their going would only add strength to their suspicions and therefore said no more. after the hunters had been gone about an hour we set out. we had just passed through the narrows when we saw one of the spies comeing up the level plain under whip, the chief pawsed a little and seemed somewhat concerned. I felt a good deel so myself and began to suspect that by some unfortunate accedent that perhaps some of there enimies had straggled hither at this unlucky moment; but we were all agreeably disappointed on the arrival of the young man to learn that he had come to inform us that one of the whitemen had killed a deer. in an instant they all gave their horses the whip and I was taken nearly a mile before I could learn what were the tidings; as I was without tirrups and an Indian behind me the jostling was disagreeable I therefore reigned up my horse and forbid the indian to whip him who had given him the lash at every jum for a mile fearing he should loose a part of the feast. the fellow was so uneasy that he left me the horse dismounted and ran on foot at full speed, I am confident a mile. when they arrived where the deer was which was in view of me they dismounted and ran in tumbling over each other like a parcel of famished dogs each seizing and tearing away a part of the intestens which had been previously thrown out by Drewyer who killed it; the seen was such when I arrived that had I not have had a pretty keen appetite myself I am confident I should not have taisted any part of the venison shortly. each one had a peice of some discription and all eating most ravenously. some were eating the kidnies the melt [1] and liver and the blood runing from the corners of their mouths, others were in a similar situation with the paunch and guts but the exuding substance in this case from their lips was of a different discription. one of the last who attacted my attention particularly had been fortunate in his allotment or reather active in the division, he had provided himself with about nine feet of the small guts one end of which he was chewing on while with his hands he was squezzing the contents out at the other. I really did not untill now think that human nature ever presented itself in a shape so nearly allyed to the brute creation. I viewed these poor starved divils with pity and compassion I directed McNeal to skin the deer and reserved a quarter, the ballance I gave the Chief to be divided among his people; they devoured the whole of it nearly without cooking.