This is because BMI does not distinguish between fat mass and lean mass (muscle, water, bone, etc).

FORBES: How Useful Is Body Mass Index In Predicting Long-Term Health?

In addition, consuming lean protein before or after workouts (within 20-30 minutes) may improve both lean body mass gains and recovery.

CNN: Should I always lift to muscle failure when weight training?

My lean body mass index showed more fat than my weight suggested.

FORBES: In Praise Of (Mostly) Vegan Diets

In addition to lean body mass, meal frequency plays a huge role in keeping your metabolism elevated, helping to keep extra pounds off while also stabilizing hormone and energy levels.

FORBES: Rosewood Little Dix Bay Expands Health and Wellness Retreats

Dr Golomb and her team believe that antioxidant compounds, called catechins, can improve lean muscle mass and reduce weight - at least studies in rodents would suggest this might be so.

BBC: Chocolate 'may help keep people slim'

It is important not to cut carbohydrates significantly on days that you are exercising strenuously, as this will negatively affect your energy level and will probably result in loss of lean body mass (muscle, bone, and water) which can impair weight loss efforts long term.

CNN: How can I maintain my energy level for sports while on a diet?