For children, 1 serving is:Ĭanned light tuna is low in mercury and is considered one of the best choices for individuals that need to limit their exposure to mercury.

However, the Food and Drug Administration (FDA) recommends selecting varieties of fish that are low in mercury for children ages 1–11 and individuals who are pregnant, trying to become pregnant, or breastfeeding.įor adults, 4 oz is considered 1 serving. Recommendations for how often a person should eat canned tuna can vary depending on several factors, including the specific type of tuna, their age, and whether or not they belong to a group that may be more sensitive to the effects of mercury.Īccording to the Dietary Guidelines for Americans, most adults should aim to eat at least 8 ounces, or 2 servings, of fish per week, which can include canned tuna.