I made the cake from all wholewheat flour, half a cup of Agave Nectar instead of sugar, and non-fat yogurt instead of whole fat yogurt and the cake still came out super delicious.
I think the texture and crumbs from my cake looked a little more coarse than the one from original recipe's picture. But I really like it. I could smell olive oil in the cake which went really well with lime.
It's less guilt kind of cake to eat.