Tryptohan rich foods without the carbs doesn't have the same impact that curd rice has.
The best way to reap the benefits of tryptophan is to combine complex carbohydrates with it. Extensive studies at MIT carried out by Richard Wurtman, M.D., showed that tryptophan, the building block of serotonin, could get into the brain only after sweet or starchy carbohydrates
were eaten. The carb rich foods create production of insulin in the body that clears the competing amino acids from the blood stream so that brain can take up tryptophan. In absence of insulin the brain prefers the competing amino acids, so eating Tryptohan rich foods without the carbs doesn't have the same impact that curd rice has. This is one of the reason when we are sad or upset we reach out for carb heavy foods, so that our brain can take up tryptophan and create serotonin.