To know nature and the dimension of the change of the customs of life leads by the Ramadan, we led a comparative descriptive inquiry before and during the month of the fast at 84 adults residents in the district of Tunis. Our results underline an increase of the consumption of meat and eggs with an average frequency of 4.3 and 6.1 times a week respectively. This overconsumption of the animal proteins contrasts with a tendency in the decline of the consumptions of vegetables. The exciting (tea, coffee, tobacco) are less consumed during the Ramadan. Also, we noted a decline of 50% of the average number of smoked cigarettes. There is an intensification of domestic links with an increase of the frequency of exchange of domestic visits. It's crossed of average from 0.7 to 1.2 times a week (p < 0.001). The phenomenon of irritability is frequently lived by near 20% of the investigated. We recommend under shape of an educational program the intensification of positive customs and the correction of negative customs, to benefit of sacred month, to tighten towards a more balanced life all year.