My understanding is that the number of carbs is a limit (don't go over 30 carbs, eg) and the number of protein is a goal (you want to eat at least 100 grams of protein eg). The rest is just filler, ie fat. The problem comes that if you eat too much fat and not enough protein, your body won't go to burn the fat from your thighs for energy. If your body can get enough energy of any variety from your diet, then you won't lose weight. If you don't get enough protein, then your body starts catabolizing your skeletal muscle, and you lose lean muscle.
Now, I could be wrong in my understanding, so if some other more educated person wants to educate us, I'm all ears.

You should be getting .8 to 1 gram of protein per lean body mass, not total

I've read from 0.6 - 1.2 depending on whether cutting or bulking.

So figure out your LBM, and from there get your protein.

My LBM is ~138 and I'm slowing down my loss and working on switching to a recomping, therefore I set my protein to 1g per lb of LBM = 138g. When I was more focused on weight loss I had my protein set to about .6g per lb of LBM = 83.

While I respect that Leo can listen to his body, mine lies to me, so I keep a close eye on what I put in it.

I am under care with a bariatric physician and he is always pushing me to get more protein. His argument is that it's easier just to keep the muscle and lose the fat. Of course, he told me to get 1.5 grams of protein for each pound of LBM, which is a ton and assuming you work out 5-6 hours a week. He says that ideally, you'll lose 15 pounds of fat for each pound of muscle . FWIW.

Good luck!

Bear in mind there are also age-based guidelines for protein requirements. The OLDER you get, the more you really need for either lean-mass retention or trying to gain muscle.

Check out the evidence-based guidelines by Layne Norton here: http://www.biolayne.com/nutrition/anabolic-eating-for-your-age/

Protein recommendations:

<20 years old: 0.7-1g/lb bodyweight

21-40 years old: 0.9-1.2g/lb bodyweight

41-65 years old: 1.1-1.4g/lb bodyweight

>65 years old: 1.3-1.5g/lb bodyweight

Keep in mind those figures are tailored to men who are working on maximizing muscle. Women need slightly less.

As far as fat goes - you'd be hard-pressed to eat too-much. Just be sure to get somewhere close to 5% of your calories in as various non-starchy vegetables, eat as much fat as you want.

Many people aim for 80% of calories from fat, especially when starting keto - and there's no health reason not to if you're eating natural fats.

Thanks for this post, at my age it looks like I ought to up my protein a bit.