Low carb + ketosis

Just a few questions -

Once you have used all your glycogen stores then the body should turn to fat right? But wouldn't it use the fat you eat first? So should I be low fat as well as low carb so that I will use my stores of fat?

I have heard that low carb and low fat is not good and that caarbs should be replaced with fat, this is why when I did it before I didn't lose any weight, because my body was running on the fat I consumed and not my stores.

Also I was showing purple on my ketone sticks and was told that I should aim for the lighter pink for effective fat burning, why is this?

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