Keto is, at best, unknown and at worst controversial. IM (or "timed eating") has been studied extensively and has been shown to help people control their weigh

Keto is, at best, unknown and at worst controversial. IM (or "timed eating") has been studied extensively and has been shown to help people control their weight. But it isn't magic. We're talking about around 5 lbs sustained loss. The "exciting unknowns" of IM and whole-day fasting are around if it is good for your medium-long term health (e.g. blood sugar control), but jury is still heavily out on that one. So, super unhelpful summary here, sorry. But nutritional science moves very slowly, in particular with long term health questions. Neither one seems outright dangerous.