Abstract: The fat caloric content of foodstuffs containing fats or oils can be reduced by adding to the foodstuffs an acidic amylaceous fermented composition resulting from a process whereina) a slurry of cereal flour and at least one additional non-cereal starch material is first subjected to gelatinization and further homogenized;b) inoculated with an acidifying strain or a mixture of acidifying strains selected from Lactobacillus species, Streptococcus thermophilus and Bifidobacterium species;c) then subjected to a fermentation over a period and at a temperature such as to afford a pH of about 3.5 to 4.6 of the fermented material; andd) finally stabilized.