Intermittent fasting is becoming a hot topic for weight loss and/or practicing calorie restriction that is limited to a certain amount of time every day, e.g. 16 hours of fasting with an 8 hour time frame of eating your daily calories..
The problem does arise as to whether people can obtain their protein requirement with that eating pattern. This pattern usually results in eating only two meals a day. The following article explains the issues. The bottom line: This type of diet may not be practical for those who want to build muscle; however, weight training does appear to help to preserve lean body mass when eaten with sufficient amounts of protein.