The 12 participants (average age of 27; average BMI of 25) followed 3 diets for 1 day each:

High-carbohydrate: A eucaloric diet providing 55% of calories as carbohydrates
Ketogenic: A eucaloric diet providing 50 grams of carbohydrates
Ketogenic + caloric restriction: A hypocaloric diet (75% energy deficit) providing 50 grams of carbohydrates

The diets contained approximately 0.8 to 1.0 grams of protein per kilogram of body weight. There was a 5-day washout period between the diets.

After the interventions, blood samples were collected while fasting and after a liquid test meal. A few hours later, the participants consumed an ad libitum lunch. Calorie intake was assessed during lunch and over the remainder of the day.

Calorie intake did not differ between the conditions. There were no differences between the ketogenic diets.

The acute effects of carbohydrate restriction Original paper