All the volunteers have a visit of inclusion in the Centre de Recherche en Nutrition Humaine. During this visit, the volunteers are informed of the methods of the protocol, the taking of samples, the disadvantages and constraints, on the basis of information letter. They have a medical interrogation and a complete clinical examination by an investigatory doctor or Co-investigator. The biological assessment is requiring 10 ml of blood and including: the analysis of the TSH, a blood count, a sedimentation test. Moreover, for the women in age to procreate, the analysis of the beta - HCG is made. To take another blood sample (10 ml) is necessary for the realization of serology HIV/HCV in the volunteers of the group of doubly labeled water, who provide samples of urine and saliva. The results are communicated to the volunteers confidentially.

Following the visit of inclusion and the signature of the consent form, a food consumption survey is performed to evaluate the energy intakes of the volunteers. Moreover, the body composition and the level of physical-activity of the volunteers are evaluated by biphotonic absorptiometry (DEXA) and using questionnaire MAQ (Modifiable Activity Questionnaire, translated and adapted by Vuillemin and Al, 1999), respectively.

The volunteers of the first group (60) performed a maximal aerobic power test on ergocycle to evaluate their maximum aerobic physical capacity (VO2max), in a hospital laboratory. A measurement of the body composition by biphotonic absorptiometry is also carried out to determine their lean and fat mass. Then, the volunteers stay 26 hours in calorimetric rooms (one evening, one night and a day). The data of indirect calorimetry (O2 consumption and production of CO2), heart rate , actimetry and other parameters are taken into account as from midnight. After one night of sleep, the individuals have to carry out series of state or exercises simulating the daily physical-activities (sleeping, writing 15 min, standing-sitting 5 min, standing 15 min, strolling 15 min, rest 20 min, eating 20 min, household 20 min, stepper 20 min, walking on treadmill at increasing speed 3 km/h, 4 km/h, 5 km/h and 6 km/h during 20 minutes). The volunteers have also to answer questionnaires on their perception of hunger, their emotional state and their visual appreciation of 6 food products at 5 times of the day (before and after the breakfast, before and after the lunch and about 16:30 pm). The rest of the time, their activities are free (watching TV, reading, listening radio ...). Measurements finish towards 18:00 and volunteers go home. The meals are balanced in proteins/glucides/lipids and cover energy needs. The menus are established by the dieticians. The meals in calorimetric room are prepared in double weighing to make it possible to calculate the actual quantities.

The second group of volunteers (60) follow the protocol of doubly labeled water to evaluate their energy expenditure during 10 days in free living conditions. For this period, their heart rate, parameters of actimetry and other parameters are recorded . The participants of this second group also answer the questionnaires of perception of hunger, emotional state and visual appreciation of 6 food products, over one day at home. The physical data recorded on this second group will be introduced into the predictive equations. The estimated energy expenditure will be compared with the energy expenditure measured by the technique of doubly labeled water. The answers to the questionnaires filled out by the volunteers of the two groups will be also compared.