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Public policies to promote healthy aging encourage people to eat well, but these recommendations must compete with other normative registers. Men and women engage with nutritional recommendations in different ways. This article studies changes in diet as men and women age in the prospective French Gazel cohort. Participants are followed between the ages of 45 and 75—the ages targeted by prevention policies related to aging. A factor analysis shows that their diet is structured by three dimensions, which express different ways of “eating well”: the expression of market norms (“fatty and sweet products”), that of nutritional norms (“fruit, vegetables, dairy products”), and that of gastronomic norms (“meat, wine, cheese”). By analyzing how individuals’ position within this space changes over time, we show that differences linked to sex and education are significant, but that men’s diets are slowly converging with those of women. The respondents’ eating habits are becoming increasingly similar to nutritional recommendations, while proximity to gastronomic norms mostly depends on the birth cohort.