The fact that relative food prices differ so markedly and so systematically provides a very strong rationale for nutrition-focused food policies.
It's not enough to simply promote healthy eating and exercise without considering the very real environmental and structural constraints present in South Africa.
Are you a meticulous lunch planner, or do you decide what's for lunch after those first pangs of hunger strike after midday? If you're in the second camp, it might be time to change.
A lot of money is spent by food producers and retailers to try and influence the type of food we buy and eat. But what can be done to encourage healthier choices?
The problem with using willpower is that your head has to keep saying "NO" to the constant barrage of messages, advertising and environmental cues that operate 24/7, prompting you to eat and drink.