Net carbs question (carbs minus dietry carbs)

Hi all,

I'm following a high protein/fat and low carb routine for the last 5 weeks or so and i've lost over a stone in weight, so it's working


However, I have a question about net carbs, as in when you subtract dietry fibre carbs from the carb amount to arrive at the net carb.

For example, I have on my breakfast list:

'Tesco Finest Outdoor bred british pork sausages'
1 sausage = 0.8g carbs, 0.3g dietry fibre and also 0.3g of 'sugars'.

So I understand that my net carbs is 0.5g (gross carbs of 0.8 subtracted by firbre of 0.3g)

That i understand and I think that makes sense, as fibre is not digested so don't count.


However, I come across foods that have a higher gram of fibre than gross carbs, so if I followed the above i would have negative net carbs...

Take for example:
'Stewed unsweetened Rhubarb'

This has 2.8g of carbs, 5g of fibre and 1.7g of Sugars.

So following what I understand to get net carbs, I would take the 5g of fibre away from 2.8g of gross carbs. Leaving me with MINUS 2.2g grams of net carbs...

I don't understand this.

Surely this isn't right, as I've still got 1.7g of sugars which will be digested!

Can anyone shed any light on this madness for me?!


Also gram values from products have been sourced from using the MFP iphone app.


Thanks,