How Much Weight Do Alone Contestants Lose?

Weight loss is the quiet engine of Alone. Nobody wins by eating well; they win by losing weight slower than everyone else and staying above the line where the medical team steps in. The figures below come from a mix of the show's own medical framing and contemporaneous reporting, so treat them as the best-documented numbers rather than a lab-clean dataset, but the range they describe is real and it is extreme.

The reported figures

The largest raw loss on record belongs to Alan Tenta, the season 10 winner, who is reported to have dropped about 78 pounds over 66 days while living mainly on cached, smoked fish. Right behind him is Zachary Fowler, whose roughly 70-pound loss over his 87-day season 3 win worked out to about a third of his starting body weight, a figure confirmed across multiple interviews he gave afterward. Biko Wright was reported to have lost close to 90 pounds before his heart-related evacuation on season 8, one of the largest losses tied directly to a medical pull.

Contestant	Season	Days	Reported loss
Alan Tenta	US 10	66	About 78 lb
Biko Wright	US 8	73	About 90 lb (evacuated)
Zachary Fowler	US 3	87	About 70 lb (a third of body weight)
Woniya Thibeault	US 6	73	About 50 lb (a third of body weight)
Carleigh Fairchild	US 3	86	Nearly 30% of body weight
Alan Kay	US 1	56	Over 46 lb

The line that ends the game

The reason these numbers matter is the show's mandatory pull threshold. When a contestant's BMI falls to 17 or below, the medical team can end the run whether the contestant consents or not, because organ failure risk climbs sharply past that point. Carleigh Fairchild is the cleanest illustration: she was medically evacuated on day 86 of season 3 after her BMI dropped to 16.8 and her weight fell to about 101 pounds, nearly 30% below where she started. Her pull, one day short of the finale, is what handed Fowler the win by default. Woniya Thibeault took the opposite path on season 6, tapping out voluntarily after losing roughly a third of her body weight because she believed a scheduled medical check would force her out anyway.

Why the winners aren't always the biggest losers

It would be easy to assume the person who loses the most weight is the toughest, but the data points the other way. The contestants who last are usually the ones who found a food source good enough to flatten the weight-loss curve before it reached the threshold. David McIntyre said he lost about 35 pounds in his first five and a half weeks on season 2, then began regaining weight in the final stretch once his gill net and traps started producing. That reversal, not raw endurance of starvation, is the winning shape. For the full leaderboard of these numbers alongside days lasted and fastest exits, our records breakdown lines them all up, and the medical evacuation list shows how often the scale, not the wilderness, made the final call.