Recently I saw a podcast of Alex Honnold with Rich Roll where Alex speaks about deliberately eating up and gaining weight before going on an Antarctic expedition (I'm assuming this is because of the climate as well as his lack of body fat as a climber). Made me wonder if this is a tactic used by trekkers as well.
In case I'm going on long hikes (10 days or more), is it advisable to eat up and deliberately put on more weight before the treks? I'm a fit male who has very less fat percentage. Eating more to put on might be a way to offset the loss of weight that'll happen over longer treks.
Note: This is not a hypothetical question. I'll be hiking for around 2 months in the Himalayas and it'll be a long strenuous two months. I am expecting to lose some weight for sure. I'm wondering if I can offset this with some weight gain before I head off.