The invention relates to the use of one or several synthetic or natural furan alkyls for preparing a drug preventing and/or treating obesity or overweight. The use of one or several synthetic or natural furan alkyls for cosmetically treating local excessive weight is also disclosed. Said furan alkyls preferably correspond to formula (I), wherein identical or different R1, R2, R3et R4 are independently of each other a hydrogen atom, a C1-C35alkyl radical, C1-C35 alcenyl radical or a C1-C35 alcynyl radical, preferably C10-C22, wherein said alkyl, alcenyl and alcynyl radicals are substitutable and R1, R2, R3 are preferably a hydrogen atom.