Interactions digestives et métaboliques entre lipides et calcium

Guéguen, Laurent; Pointillart, Alain

doi:10.3166/sda.28.117-127

Cited by 6 publications

(1 citation statement)

References 57 publications

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“…Enfin, les AG satur es a longues chaînes lib er es lors de l'hydrolyse des TAG forment avec les cations divalents alimentaires (majoritairement le calcium mais aussi de magn esium) des savons insolubles excr et es dans les selles (Gu eguen et Pointillart, 2008). Il a ainsi et e montr e chez le rat et chez l'Homme qu'une augmentation du calcium alimentaire diminue l'absorption des AG et augmente l'excr etion de lipides dans les selles (Bendsen et al, 2008 ;Boon et al, 2007 ;Lorenzen et al, 2007 ;Papakonstantinou et al, 2003 ;Shahkhalili et al, 2001).…”

Section: Effet Des Autres Composants Des Matrices Alimentairesunclassified

Organisation structurale et moléculaire des lipides dans les aliments : impacts possibles sur leur digestion et leur assimilation par l’Homme

Raynal-Ljutovac¹,

Bouvier²,

Gayet³

et al. 2011

OCL

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From the nutrition point of view, lipids are primarily considered as energy suppliers, their dietary intake having to be limited. In fact, lipids are sources of various fatty acids, and dietary recommendations include the required daily intakes in different fatty acids (fatty acid profile). Beyond these quantitative aspects, fatty acids are part of larger molecules, mainly triacylglycerols (TAG), that are organized in supramolecular structures as for example fat crystals and lipid droplets. Recent advances in nutrition research have demonstrated that these structures, and lipid organization in food matrices, influence digestibility and metabolism of fatty acids. Therefore, the members of the technological network Listral propose a synthesis of the knowledge about the influence of molecular and supramolecular structures of lipids on digestion and metabolic fate of dietary fatty acids originating from for the main food industry sectors. Fatty acids are mainly provided in the diet in the form of TAG, or phospholipids (PL) where they are esterified in external (sn-1, sn-3) or internal (sn-2) position of the glycerol backbone. They can also be found as ethyl esters (EE) in specific formulations. These molecular characteristics of the lipid molecules affect their hydrolysis and their absorption rate but also their metabolism in indifferent organs, as assessed in studies often using inter esterified fat sources. The results depend on the types of fatty acids (saturated or polyunsaturated fatty acids) but also on the model used for the studies: in vitro or in vivo studies ; animal model, human newborn or adult, either healthy or exhibiting some diseases. Among others, it was found that the crystal form and fat melting point as affected by the fatty acid profiles and the lipid molecular structures directly impact fatty acid absorption kinetics through modifications of lipolytic enzyme activities. However, in these studies, the relative effect of the thermal properties of lipids and the proportion of saturated fatty acids chains in sn-2 position were hardly distinguished. Supramolecular structures, namely type and size of the fat droplets and their interfacial composition, of lipids, either in their native forms or obtained after food processes, also affect the digestibility and absorption of lipids. This aspect is reviewed with specific focus on dairy, marine, meat, oil plant and egg products. The impact of other nutritional components present in these food matrices on the absorption of lipids is also discussed.

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