Fluorescent glucose monitoring
Old article but started reading through the papers its from. It's a subcutaneous injection of a hydrogel fiber that will fluoresce when glucose levels are high.
Heres the paper.
One could even make a reactive tattoo that glows after you eat. If the design was simple enough anyway. Great for diabetics too.
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"and continuously responded to blood glucose concentration changes for up to 140 days"
"three of four PEG-bonded PAM hydrogel fibers induced only mild inflammation"
That doesn't sound as long-term and biocompatible as they want it to be seen.
Anyway, I think fluorescent implants is something people with enough knowledge should look into, maybe just simple glowing implants that charge with sunlight and glow by night are possible? Also the article seems to contain informations about light under the skin nobody developing such implants thought about, like photobleaching, skin radiation damage, cancer development...