Food waste is one of the greatest economic and ethical challenges in the world. Realizing sustainable solutions for food security is one of the major research thirsts for next-generation (6G and beyond) wireless technology. Empowering consumers with the ability to assess the quality of fruit with upcoming 6G mobile technology can be a game changer for reducing waste and motivating a healthier diet. In this research, we present Meta-Sticker a novel low-cost non-invasive 6G (sixth generation) wireless solution for accurate fruit sensing via a D-band (110 to 170 GHz) metamaterial sticker. The key idea is to exploit fruit as a substrate for resonating meta-atoms. Changes in the chemical composite of the fruit over time (e.g., sugar and water concentration) yield variation in the dielectric properties of the fruit (here substrates). Interestingly, this would affect the resonant frequency of the Meta-Sticker. We designed Meta-Sticker to resonate in the D-band for their compatibility with 6G mobile technology, sensitivity to water, mm-scale penetration depth, and non-ionizing features that offer high-resolution inferences from the inner pulp of the fruit. We demonstrate that our system can estimate Brix and Dry Matter in three different types of fruits with an average normalized RMSE value of 1.24%. This error yields a negligible impact on taste and is imperceptible to the consumer. Our design is non-invasive, low-cost, passive, biodegradable, and conformal. Our system is robust to arbitrary fruit orientation and distance to the transceiver; thus, can be reliably adopted in future handheld devices compatible with 6G wireless technology.