Some health experts believe that, though the low-carb diet craze may have helped people lose weight, it may not be helping their mood and motivation. They point to the fact that complex carbohydrates are needed to ensure the absorption of critical nutrients such as tryptophan into the brain, where brain cells, known as neurons, can convert the amino acid into serotonin.
In any case, complex carbs also supply energy to ensure the proper functioning of our bodily processes, including serotonin production. So, it’s important to get sufficient complex carbs in your daily diet in the form of whole grains, nuts, seeds, and legumes.