Habits v Willpower

My habit is to choose the healthiest choice on the menu... but then why is it so hard for me to turn down a piece of cake or pastelito? Where do habits end and willpower begin?

My mom said today that she heard a habit is formed after 21 days; both she and I had to wonder what magic happens on the 21st day...

For me, I'm still trying to figure out what the trigger is... why some days I have absolutely zero desire to veer off course and other days I can barely think straight because I'm so distracted by the thought of chocolate. Seriously- my mind almost shuts down until I satisfy the craving! Is it emotional? Is it Hormonal? Circumstantial? It's just so weird to me... and annoying because it makes me feel like I am not in control!

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Okay- random ramblings aside... here's my status report for today:

SLEEP

Didn't go to bed early enough last night (like 3:30am or so)...

FOOD

Breakfast= Coffee, Cliff Bar & some almonds

Lunch= Salad from Quiznos and a bag of baked Lays (I ate the chips in line because it was 2pm and I was starving...)

Dinner= Tuna sashimi, cabbage salad & a bowl of berries for dessert

Water= 3 liters +

EXERCISE

Crappy workout!!! Had a very short bicep & tricep workout with a few sets of crunches. Better than nothing though... ? Also, no cardio.