Abstract: Novel fat mimetic compositions are disclosed to be useful in reduced calorie foods. These compounds, which can be referred to as amide linked fat mimetics, consist of fragments bearing ester, ether, and/or amide groups joined by an aliphatic or alicyclic group through at least one amide linkage. These complex amide linked fat mimetics may be partially broken down in the body to produce digestion residues which are substantially nondigestible themselves and are sufficiently hydrophilic to enable the digestion residues to be incorporated in the normal stool. These fat mimetic compounds are useful as replacements for fats and oils for most food applications.

Abstract: Amphiphilic lipid compound having the formula: ##STR1## in which: R.sub.1 denotes a C.sub.7 -C.sub.21 alkyl or alkenyl radical,R.sub.2 denotes a saturated or unsaturated C.sub.7 -C.sub.31 hydrocarbon radical,COA denotes a group chosen from the following groups:a) COOM, M being H, Na, K, NH.sub.4 or a substituted ammonium ion derived from an amine,b) ##STR2## B being a radical derived from mono- or polyhydroxylated primary or secondary amines and R denoting a hydrogen atom or a methyl, ethyl or hydroxyethyl radical,c) ##STR3## Q denoting a substituted aminoalkyl or ammonioalkyl radical and R having the meaning indicated for b), andd) COOZ, Z representing the residue of a C.sub.3 -C.sub.7 polyol, and a process for its preparation.Cosmetic or dermopharmaceutical composition comprising the said compound and especially an aqueous dispersion of liposomes.