Yes, some form of jewellery that would measure your hydration levels would be awesome! Many people struggle with this and the regular apps often don't help enough. You are right that there is still much room for improvement in this field.
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Yes and a wearable that doesn't look like a wearable. I think most wearables right now do not look very fashionable. Or even some sort of tooth implant that could do all the monitoring without any need to really wear anything at all.