@abcd99 When eating a low carb high(er) fat diet your kidneys tend to flush out more fluid, and as a result you're liable to lose more vital minerals (e.g. salt, magnesium and potassium) which need to be replaced, so you often see advice to drink broth on this type of diet,
and which is why IMO salted butter is an essential part of an LCHF diet.
If you are eating both high carbs and high fats, since the body prefers the easy fuel route it will preferentially use the carbs and any surplus fuel/fat gets stored. This preference apparently also means that being carb oriented, your body no longer has access to this stored fat so you'll end up putting on weight. Cutting the carbs right back and keeping them down means eventually your body will be forced to switch over to both fat and carb burning (again).
.(I think this may actually have been part of my weight problem as I was used to, and have always eaten, full fat food. When my husband took over the cooking, we also ended up with a very carb diet and I ended up putting on a lot of weight - having spent the first 30 odd years of my life mainly underweight... whereas he's always tended to be a low fat/margerine type eater ,,,
)
Robbity