With honest planning, yes, a trek can usually accommodate a food allergy, but no operator on this mountain can credibly promise zero exposure in a shared camp kitchen, and you should treat any absolute guarantee as a warning sign. Rinjani kitchens are a single stove, shared pots, and supplies carried in open sacks by porters, and cross-contact happens even when the cook is careful.
The peanut question deserves specifics. Published Rinjani menus run to dishes like gado-gado, which in most Indonesian cooking comes with peanut sauce, alongside fried noodles, pancakes, bread, and spaghetti, and peanut ingredients also appear in snacks and sauces. It is not true that every meal on this mountain contains peanuts, but it is true that peanuts are one of the most common ingredients in the regional food your crew will buy at the Sembalun market, so a severe peanut allergy must be planned as a market problem, not just a menu problem.
What actually protects you is the booking process. Send the operator the exact allergen, the ingredient names translated into Indonesian, your reaction history, and your emergency plan before you pay. Ask who buys the ingredients, who reads the labels, who cooks, and whether separate utensils and snack supplies can be kept apart from the group’s. Get the answer in writing. If the operator answers with vague reassurance instead of a process, that is your answer.
Medical guidance for severe allergies is direct: people prescribed adrenaline auto-injectors should carry two, and anyone who uses one needs emergency care afterward. A guide with a first-aid kit is not a hospital; the rim is hours from a road even in a fast evacuation, and phone coverage on the mountain is patchy. Trek with your medication in your own daypack, not in a porter’s duffel, and make sure your guide knows exactly where it is and how you would use it.
We cook our own trips, buy our own ingredients, and brief our cooks on every declared allergy, and we will design a menu that avoids your allergen entirely. But we also say plainly to guests with anaphylactic risk: bring agreed backup food for the days when an ingredient substitution fails, because an honest operator tells you what can go wrong as well as what usually goes right.

