Discrepancies NHS and Fitbit. Why does my nhs bmi say I should eat 1800 to 2200 cals and fit bit says 1500?

[Portlandprincess]

NHS or Fit bit. Which is right? And why are they so different? Any ideas?

[moreless Administrator 7 stone]

Because the NHS BMI calculator takes into account your average exercise and Fitbit will adjust your intake to match your output. However, both are only rough estimates and as you're following a low carb eating plan, you don't need to count calories anyway

[Portlandprincess in reply to moreless]

Thank you. You're right about cals counting though. I'm getting to guestimate more now. I do think NHS is more sensible though.

[Wordsworth2]

The fitbit will calculate how many calories you need to maintain your weight then it will take away the number of calories you need to lose up to 2lbs a week. The less you want to lose (when it asks you your goal weight and time) the higher the calories and vice versa. If you want to lose more over a shorter period it'll take away more calories from your maintain calorie intake. It will take your height and weight into account when calculating this.

[Portlandprincess in reply to Wordsworth2]

Thank you. I need to check. Didn't think I'd put in my goal weight in yet.