By today's standards the diet is high fat, but I just eat the fats which are there naturally in the meat and fish, or with the meat I save the fats which come with them and use them to cook other things.
For instance, I use a hot air fryer to make chicken thighs with crispy skin, then throw in button mushrooms too cook whilst I pinch the skins - er - whilst the skins mysteriously evaporate....
For scrambling eggs I add a little olive oil, the yogurt I eat is the Greek full fat kind, I never pick up anything labelled as low fat.
Between my blood tests at 80 days from diagnosis and 6 months my triglycerides reduced from 2 to 1.5, and all my ratios were good normal or ideal, for cholesterol - which should not have happened if you believe the hype about fats.
There are essential fats, and proteins, but no essential carbs.