Purpose: To determine how adults and registered dietitians (RDs) perceived foods according to a frequency continuum, and to assess the differences between them. Methods: A sample of 1002 adults and 566 RDs were recruited. Participants had to associate 51 foods with a frequency continuum (“daily”, “occasional” or “sometimes”). Food groups were created: 1) Canada’s Food Guide’s groups (CFG) (n = 22), 2) High in Fat or High in Sugar foods (HFHS) (n = 16), and 3) Meals (n = 13). Results: CFG were perceived as “daily” foods (adults = 56.8%, RDs = 94.5%), HFHS as “sometimes” foods (adults = 67.2%, RDs = 59.6%) and Meals as “occasional” foods (adults = 75.8%, RDs = 58.2%). Adults (all age groups) perceived that CFG and Meals should be eaten less frequently than RDs (18 to 64 years old). Younger adults perceived these two groups as to be eaten more frequently than older respondents. Adults perceived HFHS as to be consumed less frequently than RDs (no age effect). Conclusions: While adults tend to have more severe perceptions than RDs, results show that their food perceptions are in line with an overall awareness of Canadian nutrition guidelines, suggesting the presence of a relevant popular knowledge about the value of food.