Go ahead! Kid, you just hit puberty...

I read The 4-Hour Body. I want to share, at least for now, a chapter about the Clitori, which is the upper middle part of the female vulva and the Labia Minora and the Vestiblue(on the left side) etc. etc. and its scientific relevance. Take a look into it.
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The question to ask, then, is, "How a person(Male/Female) of any age do the Intermittent Fasting(IF)?"
Observatory Studies + Self-Experimentation

• 8/16 hours to 6/18 hours: Eat for 8 hours but don't eat for the next 16 hours. Some people eat for just 6 hours with an 18 hour break.
• 45-minutes(time doesn't matter in this case) before breakfast: an Egg. 
• 2:30 AM: (I cheat on this one and move it to 3:00 AM often)
• Workout.
• Back Muscle Contracted Push-ups: 3 Sets w/ 5 Reps on each.
• Back Muscle Contracted Dips: 4 Sets w/ 7 Reps each(I use Grease The Groove Workout. Google it). I use 5 seconds interval(My choice).
• Back Muscle Contracted Janda Sit-ups, arms crossing over shoulders: 2 Sets w/ 5 Reps each.
• Skipping and Janda Sit-Ups: 2 Sets of 40 Reps. You can also use 4 sets of 40 Reps. I used the latter but I found my legs hurting the other day. Between each set, be sure to interrupt with 5 Janda Sit-ups(Google it too).
• Breakfast - 3:00 AM: Roti or Paratha with Green vegetables, french fries and, on rare occasions, cooked meat with gravy, be careful with this one as protein can shut down Ketosis reaction in your body, if calories are not balanced(that's why I add Roti and Potato).
•  Lunch @ 7:15PM: Citric acid is not bad and is preferable in place of Orange juice(I cannot guarantee any upsides for this one). There's an Indian dish called Dahi Bada. My Dahi Bada version has the chickpeas, potato chunks and "Bada"(which is silly amount of Carbos calories) in it.
• Post/Pre-Lunch: (this one can be either pre or post-lunch depending on you circumstances) Spaghetti or Macaroni. This is the food that is very important. You can remove all other embellishments but this one is absolutely important. I use others because of my craving for Indian tastes. You don't have to do the same.

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Some Data that is skewed but made sure something was changing:
--Before:-
Belly Fat: 86 cm;
Right Arm: 27.3cm;
Left Arm: 26cm;
Right thigh: 48.1cm;
Left Thigh: 47.5cm.
Total: 234.9cm
--After: 3-weeks have passed-
Belly Fat: 83.65cm;
Right Arm: 27.5cm;
Left Arm: 26.9cm;
Right thigh: 47.5cm;
Left thigh: 46.4cm
Total: 231.95cm

Cheat Note: On the Second week; Monday to Thursday I cheated on Slow-Carb diet, unfortunately, from Friday to Sunday, I started fasting and was unsure whether Ketogenic reaction took place between that time span.

The Third week: I was on a Ketogenic Diet.

Misleading Indicators: Second Week
Belly: 84cm;
Right Arm: 27.4cm;
Left Arm: 26.1cm;
Right thigh(10 degrees above Quadriceps Femoris): 46.1cm;
Left thigh: 45.8cm
Total Fat + Muscle = 229.4cm
On this week, I also cheated on Dips - doing 4 Sets of 5 Reps than 28 Reps(4 Sets of 7 Reps).
Not so much Fun, indeed.

Dated: 13 May to 27 May.

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One Noticeable pattern was whenever I was deficient of Fat from my diet, I would Poo much much later. As compared to that, when I had the right mix, I would poo instantly(1 to 2 hour) after Breakfast and Right after Lunch(8:00 PM).
I don't know whether my "enzymes" were affected by this experiments. I have no way to measure that. So that's it. Those reading and probably thinking I was screwing up my "enzymes", please know I, exactly, don't have measurements to counter your sweeping generalization(s).