[New techniques in nutritional surveys and food educational programs: volumetric dietetics for portion size assessment]. / Tecniche innovative per la sorveglianza nutrizionale e l'educazione alimentare: la dietetica per volumi.

Data in literature show that body weight in adults and children seems to be related to portion sizes more than to food choices and people are more reluctant to give up favourite foods than to reduce portions. So several scientific societies in USA have recently emphastzied the need to select appropriate portion sizes. At the same time, studies on cognitive strategies show that the best method to help people to remember how much they eat is visualisation/comparison to tridimensional visual aids. So a new technique for evaluating portion sizes, based on comparison of portions to volume of usual objects (baseball, dice, deck of cards) appeared in the last years, in nutritional surveys and food educational projects. Our team, since 1990, appointed a volumetric assessment based on comparison of foods to the fist, palm, fingers of the examined subject; this system has been experienced with success for a long time both in individual dietetics and in food educational projects or surveys. Since the interest for this new technique is rising, the aim of this review is to introduce the method and to delineate the applications in nutritional surveys or educational projects in national and international literature. This method, simple practical and intelligible, seems to be addressed to a wide development in the future.

[TV, overweight and nutritional surveillance. Ads content, food intake and physical activity]. / Sovrappeso e TV: aspetti di sorveglianza nutrizionale. I tipi di spot, consumi alimentari e attività fisica.

The relationship between television viewing and obesity in children and adults was examined in a large number of cross-sectional epidemiological studies. Some randomised, controlled trials confirmed the evidence that television viewing is a cause of increased body fatness. It seems of utility in nutritional surveillance to esteem time spent by children and adults in television watching and to evaluate ads contents and food preferences suggested by them. This editorial shows a two-years long analysis of food commercials broadcasted by the main Italian TV networks; food ads targeted on children, housewives and sport fans were evaluated; the relationship between television viewing, commercials and food intake or global lifestyle was investigated in a Piedmont's population (from Northern Italy). School projects aimed to reduce television viewing represent a promising strategy for preventing childhood obesity.