It's impossible to be knowledgeable about all health claims, so Dr. Idrees Mughal recommends looking out for common tricks.SDI Productions/Getty ImagesBogus health advice is widespread online, and often follows a few strategies.Misinformation can harm a person's physical and mental health.Look out for big claims and conspiratorial tones, Dr. Idrees Mughal advised.A doctor who challenges nutrition misinformation online and wrote a book about common tricks, listed red flags to look out for.Health misinformation can cause real damage to physical and mental health so it's crucial to learn how to spot it, said Dr.