I'm going to hazard a theory why the olive oil in the morning causes weight loss. I do something similar, except I use coconut oil. I put a dollop into my morning coffee along with other foods like tumeric and, cocoa beans. I'm making up an energetic cocktail with lots of good stuff in it. The fats in this slow digestion and cause satiation. It doesn't seem to me like there's any rocket science to it. Fats are slower to digest and provide long lasting energy. If you keep the carbs in this low or non-existent, you don't get an insulin rush, which leads to depletion which leads to hunger pangs. When I have this drink I often feel pretty well wrapped until noon or so. I would typically give myself a protein rich snack, maybe a hard boiled egg, perhaps an apple or carrot at mid morning, but today for example my activity level is low so just one egg at mid morning and I feel pretty energized. If you are able to cut out a morning meal, slow digestion, and keep away hunger pangs, you will eliminate all the caloric activity that usually gets ingested in the morning, plus get a longer fast. You're not really fasting of course, but giving the gut a lot less to deal with in the morning. I get a big dollop of olive oil in my lunch/midday salad, a big one with more protein and lots of green stuff, nuts and so forth. Insulin level still stays low, more fats, so you're pretty much good to go until evening.

My two cents worth, your mileage may vary.