My BMI is 24. I'm a size 12. Feel like my weight is OK but could lose a bit. Reading the NHS website, it says you should lose weight if your waist is bigger than 31.5 inches, and see a GP if your waist size is over 34.5 inches and you're at risk of serious health conditions. My waist size is 37.5! Really anxious about my body image. If I lose 6 inches, surely my BMI will be really low? Anyone else experienced similar? I'm 5ft8 and weigh around 11 stone.