A period of “detox” is probably good for you. Relax, take some light exercise and eat better and you will probably food better. You might feel better yet if you really believe in the healing power of your regime. An exotic macrobiotic smoothie with particular herbs might make you feel great.
Detoxification is just a metaphor though. If there were “toxins” leaving your body (what these molecules are is never specified) then they could be measured. (They can’t). Even if there was a measurable chemical change in urine, for example, you would still need a double-blind clinical trial to show benefits.
The placebo effect is powerful and we should use it to our advantage. Believing the metaphor is a physical reality becomes problematic though if it leads you to promote detox as a ‘remedy’ for real disease. Belief is powerful, but when making medical recommendations belief it must come second to data.