Purpose of the study was to detect hygienic-nutritional habits of Slovene trekkers, alpinists and sport climbers and possibilities of subsequent poisoning; research how trekkers, alpinists and sport climbers care about safety of the food they take with them outdoors, to the mountains or climbing crags. The strategy of cross-section study with descriptive method of work has been used. Gathering of data took place in August and September 2012 with the help of an anonymous online questionnaire. Quantitative data analysis has been elaborated in the SPSS Statistics V19.0 program. Results have shown that trekkers, alpinists and sport climbers (n = 350) usually eat food they bring from home, or combine their own food with that available in mountain huts. Most often their own nourishment consists of imperishable foods. There were cases of food poisoning between respondents during outdoor activities. The chances to consider hygienic principles are rather reduced outdoors. Some statistic differences were established in providing the safety of food regarding gender. Women are more careful when preparing food.