Swollen feet may be related to physiologic factors, cardiac insufficiency, hepatic insufficiency, renal insufficiency and other causes. Physiologic factors do not need to be avoided. Swollen feet caused by cardiac insufficiency need to avoid salt, and in renal insufficiency, limit the intake of sodium and protein. However, dietary control cannot replace drug treatment. 1. Physiological factors: some patients will have postural edema or premenstrual edema, edema has no close correlation with food, usually can eat normally, observation. 2. Cardiac insufficiency: patients commonly have water and sodium retention, at this time, sodium intake should be limited to maximize the relief of edema. A low-salt diet is the main focus, and foods containing too much sodium, such as salted vegetables, seaweed, seafood, bacon, etc., should not be eaten. 3. Renal insufficiency: water and sodium retention also occurs in the late stage, food needs to be based on low-salt diet, protein also needs to be controlled, especially non-quality protein, and protein intake needs to be strictly limited in the late stage in order to control edema in the body. There are many other causes of swollen feet. It is recommended to seek timely medical attention to identify the cause and adopt scientific and effective treatment according to the cause.