Metabolic diseases encompass a range of disorders resulting from disruptions in amino acid, glucose, lipid, or energy homeostasis. In recent years, there has been increasing recognition among researchers that static magnetic fields (SMFs) can have diverse effects on certain metabolic diseases. Cellular and animal studies indicate that SMFs elicit markedly different responses in animals, depending on whether they are healthy or have pathological conditions. Notably, several studies have reported that SMFs with specific parameters could have beneficial effects in mice with diabetes, fatty liver disease, and cancer. However, the safety threshold for SMF exposure appears to be significantly lower in mice with severe metabolic diseases, such as severe diabetes or alcoholic liver disease, compared to healthy mice. Furthermore, the SMF direction is also an indispensable factor in regulating pathological conditions involving cell proliferation. This review aims to summarize the impact of SMFs on prevalent metabolic diseases, including diabetes, fatty liver disease, and cancer, explore their potential mechanisms, and address the factors contributing to the inconsistent findings in the literature. The goal is to provide a foundation for the future development of SMFs as non-invasive, highly penetrative physical approaches for diagnosing and treating metabolic disorders.