i can't speak for weight loss, but iirc your body starts to "eat"/digest some of the worst cells (autophagy) after around 12 hours with just water, tee or black coffee.. so intermittent fasting 16 hours and eating just 8 hours may really help you with lots of things. i've never even heard anything negative about it, quite the opposite, even after just a short period of trying.. it may even help against cancer, some scientists were researching:

Autophagy and intermittent fasting: the connection for cancer therapy? - PMC

Cancer is a leading cause of death worldwide, and its incidence is continually increasing. Although anticancer therapy has improved significantly, ...