The lower sugar content plus the absence of saturated fat, e.g butter. Using light olive oil adds monosaturated fat to the muffins, a much healthier option.u003cbr/u003eu003cbr/u003eAlso using wholemeal flour will add welcome fibre to the muffins without making them dense and heavy.u003cbr/u003eu003cbr/u003eAnd not to mention the amazing anti-oxidant properties of the Blackberries!