2018 mein eik research ki gayi jisme 2 groups banaye gaye. Eik group ko bina cheeni aur doodh ke black coffee di gayi, doosre ko nahi. Kuch hafton baad black coffee lene walon ka wazan zyada kam hua. Black coffee metabolism tez karti hai, bhook kam karti hai aur calories kam honay ki wajah se weight loss mein madad milti hai.