Being a practitioner of Shaolin, we preach moderation and balance in all things. It is a fundamental principle in Shaolin to care for one's body and be in peak condition. However, one cannot be in peak condition and be unbalanced, nor can they be in peak condition by following extremes. This is why we train 5 h a day, 5 days a week, not 8 hours a day everyday. This is why we eat healthy 95% of the time, focusing on vegetables as our main source of nutrients, but leave space for that slice of cake once a week. You're dealing in extremes and it will be hard to maintain. You did an amazing job losing excess weight. You should strive for a body fat % of around 8-12%, which is a very healthy, lean range to be in. Have your body fat calculated by your doctor, ask if it is safe to cut further, and tell them that you would like to be in that range. Don't deal in extremes. Your goal should be to be healthy.