An expert has revealed seven popular foods that could be causing your energy levels to crash. In the UK we love to snack. Many of us munch on treats between meals as a means to ward off hunger and give ourselves an energy lift. Yet certain foods can have the opposite effect, leaving us feeling more tired because they trigger blood sugar surges . And actually many of the snacks we're fond of eating across Britain are guilty of precisely this. Consequently, when selecting what to consume between