According to this article {here], confidence can help with anxiety and depression, affecting how your brain’s cells function. It can also help with memory, immune system and brain functioning. The article also includes some tips for boosting confidence. Other researchers have found that some types of vitamin B that are found in foods such as Marmite can also affect brain chemistry in a way that helps with anxiety symptoms. However, the study (as described here) used very much higher doses than are found in usual Marmite portions.