 François' langur is selective in its diet, in Nonggang Nature Reserve, China, it primarily eats the young leaves of 10 different species of plants, only two of which are common within the reserve.Its diet includes "Pithecellobium clypearia", "Ficus nervosa", "Garcinia pauncinervis", "Sinosideroxylon pedunculatum", "F. microcarpa", "Miliusa chunni", "Securidaca inappendiculata", "Bauhinia" sp., and "Canthium dicoccum".Though these are the preferred plant species, it still consumes other plant species opportunistically.