JUDDD/IIFYM

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I've been doing this eating plan for about 2 weeks and have lost close to 6lbs.
On up days i eat close to 1,830 calories and on down days i eat 450 calories.

My percentages for IIFYM are
25% Carbs
35% Fats
40% Protein

I also have PCOS/Insulin Resistance so lower carbs do well for my body (114 grams)

I'm wanting to start logging my progress into MFP (i currently use the *crappy database on UP-Jawbone)
Is it necessary to log on your fast days on MFP?