Your microbiota also plays a large role in your metabolism; sugar, refined carbohydrates and junk foods cause certain bacteria to release endotoxins, which drive inflammation and cause metabolic changes that result in overproduction of insulin, increased appetite, increased fat storage and obesity (articles.mercola.com)
Carbohydrates cause overproduction of insulin, increased hunger, and weight gain. (felinedocs.com)
Over time, this kind of chronic overproduction of insulin creates a state of hypoglycemia (low blood sugar), which is characterized by symptoms like shakiness, fatigue, irritability, and yes, anxiety. (mindbodygreen.com)