you can use resources to figure it out I use Plato to and it can be vague so it took digging to find the answer
Internet: Websites should be from credible web addresses ending in .edu (an educational institution), .gov (government agency), or .org (non-profit). Any web pages that end in .com (commercial) or .net (networks) should be reviewed with caution.
Books, newspapers, and magazines: Examine the author’s qualifications. He or she should be educated in the field of nutrition/dietetics, and preferably hold a degree from an accredited university (RD, DTR, LD, or MD). These individuals should also belong to a credible nutrition organization.
Television: Make sure that the findings are well researched and repeatable; one study doesn’t make a finding absolute. Be critical and look for follow up studies.
For all media sources: Make sure the information is referenced with cited sources. Seek out multiple perspectives regarding nutrition advice, and ask a nutrition expert about the source of the findings. Ensure that the information is current and informing, not attempting to advertise or sell a product.