Not that anyone will listen, but high fat diets are very dangerous.
The reason there are positive experiences with such diets is due to the elimination of high glycemic carbs. These cause Insulin swings, which causes Insulin resistance, hunger, exhaustion, fat gain and a whole host of long term problems. Limiting high glycemic carbs while eating mostly low glycemic carbs does close to the same as a keto diet with none of the long term health consequences. Naturally you are going to feel the effects of Insulin compared to a keto diet, but it's worth it since you will not be destroying your arteries and heart.
Then there's the advantages. Leptin is a hormone that blunts hunger and various studies show that fat consumption does not have a significant effect on Leptin, while carbohydrates raise Leptin. This means that carbohydrates reduce hunger, basicly. This is often not noticed for those that are obese because Leptin is produced by body fat. So with a lot of body fat, you have a lot of Leptin. This causes Leptin resistance. So when you lose weight, your Leptin production lowers but it takes longer for Leptin resistance to be reduced. Hence leading to yo-yo dieting. But when you get to the lower levels of body fat and Leptin resistance lowers as well, then carbohydrates are very effective at preventing hunger (at a low enough body fat you are pretty much always hungry, been there done that).
Fasting has similar effects (Daily 16 hour fasts, for instance) and also helps prevent issues with Insulin when eating low glycemic carbs. Fasting blunts hunger because there's no Insulin swings. Then there's Ghrelin but that one is even more confusing. Long story short: if you always eat at 7:00, 12:00 and 18:00 then you will be very hungry at those times. If you eat at 18:00 only then once you get used to it you will not be hungry until 18:00.
So yea... No oil: