A new wristband tracks what you eat, and a shower attachment helps conserve water.

Each week PSFK features many new and innovative apps. To highlight the some of the best, we’ve compiled a roundup of the most interesting and creative apps written about on the site these past seven days:

Nutrition-Tracking Wristband Monitors Calories, Carbs & Protein

Adding to the quantified self movement is AIRO, a bracelet that tracks what you’re eating. With tiny LEDs on the band’s interior, it can detect metabolites that pass through the wearer’s bloodstream, calculating nutritional intake.

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