Lucy, the best way to add more fat is to, um, add more fat!
(Sorry!) What I mean is to either add lots of butter to your vegies or stir fry them in olive oil. Add mayo to whatever you like and make lots of sauces from meat drippings, cream and butter.

And Smittlem is absolutely right about the bars - they contain hidden carbs in the form of sugar alcohols. (For more info on sugar alcohols, read "The truth about low carb sweeteners info" at the right hand side of your screen.)
They are YMMV thing though, some folk have no problem, but many do.

Cheers!

Rosebud