I found myself saying this - but also @NinMD’s point - in one conversation recently and I realized they seem contradictory.
In a given meal, adding fat to carbs will slow down your glucose response (so, for instance, you’ll get a bigger glucose jump from jelly beans than from a high fat ice cream even if they have the same amount of sugar*)
AND
the jump in insulin from any carbs will prevent you from accessing your fat stores, and if you’re regularly combining fats and carbs (so basically HCHF) you’re putting yourself in fat storage mode while giving your body plenty of extra fat (and sugar) to store.
Not sure if that helps…
*depends on the person, obviously, but as a general rule, fat will blunt the sugar hit (from what I know)
ETA: this is a reply to Nin, not to Donna!