Bear in mind that those macronutrient ratios refer to calories from fat, protein, and carbohydrate, not actual grams of each. Protein and carbs have 4 calories per gram and fat has 9 calories per gram, so it’s actually a relatively easy task to let your fat calories pile up to keto-appropriate proportions if you consume fattier proteins and embellish your food with an extra bit of pure fat. To illustrate, if a portion of a particular food has 10 grams of protein, 10 grams of fat, and 0 grams of carbohydrate, that portion contains 130 calories, 90 from fat and 40 from protein, and is about 69.2% fat and 30.7% protein (allowing for rounding).
On a ketogenic diet, your entire body switches its fuel supply to run mostly on fat, burning fat 24-7. When insulin levels become very low, fat burning can increase dramatically. It becomes easier to access your fat stores to burn them off. This is great if you’re trying to lose weight, but there are also other less obvious benefits, such as less hunger and a steady supply of energy. This may help keep you alert and focused.