Sweet potatoes are very rich in beta-carotene, a plant compound that is converted into vitamin A in the body.Vitamin A is essential for growth, as well as for the differentiation of most cells and tissues. It is very important for healthy fetal development (20).Pregnant women are generally advised to increase their vitamin A intake by 10–40% (21, 22, 23).However, they are also advised to avoid very high amounts of animal-based sources of vitamin A, which may cause toxicity when eaten in excess (24).Therefore, beta-carotene is a very important source of vitamin A for pregnant women.Sweet potatoes are an excellent source of beta-carotene. About 100–150 grams (3.5–5.3 oz) of cooked sweet potatoes fulfills the entire RDI (25).Furthermore, sweet potatoes contain fiber, which may increase fullness, reduce blood sugar spikes and improve digestive health and mobility (26, 27).
4. Salmon
Salmon is very rich in essential omega-3 fatty acids.Most people, including pregnant women, are not getting nearly enough omega-3 from their diet (28, 29).Omega-3 fatty acids are essential during pregnancy, especially the long-chain omega-3 fatty acids DHA and EPA.These are found in high amounts in seafood, and help build the brain and eyes of the fetus (30).Yet pregnant women are generally advised to limit their seafood intake to twice a week, due to the mercury and other contaminants found in fatty fish (31).This has caused some women to avoid seafood altogether, thus limiting the intake of essential omega-3 fatty acids.However, studies have shown that pregnant women who eat 2–3 meals of fatty fish per week achieve the recommended intake of omega-3 and increase their blood levels of EPA and DHA (32, 33).Salmon is also one of very few natural sources of vitamin D, which is often lacking in the diet. It is very important for many processes in the body, including bone health and immune function (34, 35).