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A spike in blood sugar will only occur if you consume too much sugars at once than what the body needs. The oil just makes the energy last longer. Also if you just drink the juice, you will have to drink it much more often than if you didn't add any oil to keep your blood sugar level. Here is a paragraph from an online book that explains how blood sugar level works:
Diabetes is caused when the intake of energy (from protein or sugars) is different from the need for that energy.
Naturally, this does not happen, but milk, wheat products and foods that have been heated in any way, always contain physical addictive substances, stimulating food consumption regardless the physical need for energy. That is why obesity often comes with diabetes.
But diabetes also occurs in thin people;
Your body has two types of energy at its disposal: fat-like substances and sugar-like substances. Consuming too little fat de-stabilizes blood-sugar levels, which is what eventually can cause diabetes.
So, sugars don't cause fat, and consuming protein or sugars can only cause diabetes in the relative absence of fat, because you need that fat (fatty acids) to be able to deposit redundant blood-sugar glucose) into the fat-depots (as glycerol).
Psychological stress can also cause diabetes ; stress increases adrenaline secretion, increasing blood-glucose level. If this glucose is not used for physical activity, this may eventually cause diabetes too.
To prevent diabetes: eliminate psychological stress. Consume as little cooked food (proteinacous prepared food in particular) and make sure to consume sufficient fat with every meal.
Full article:
http://www.youngerthanyourage.com/13/diabetes.htm
S.