Just don't do it. Going to the supermarket when you're starving spells disaster, because all you can think about is what you want to eat RIGHT THAT SECOND. And that's unlikely to be a salad. The consequence is that you will either A) grab a [insert unhealthy snack food of choice here] and eat it as you walk around or 2) make purchases on the basis of your hunger, and then overeat when you get home (or to the car, if you can't make it that far).2. Not writing a list
Have you ever been to the supermarket, spent P500, and still had nothing to cook for dinner? Us too. To avoid this happening, make a plan in advance of the meals you want to prepare that week, write a list of what you need, and try and stick to it. Another idea is to take a screenshot of a recipe on your phone, and have this on hand as you shop.3. Avoiding the frozen section
Yes it's home to frozen pizzas, ready meals, and tubs of ice cream. But the freezer section is also where you can pick up really affordable bags of frozen fruit and vegetables that are great for when you want a quick and easy meal with minimum preparation. Frozen produce is usually picked, packaged, and frozen within a very short time-span. This means it may actually contain more nutrients than some supermarket "fresh" fruit and vegetables, which can lie in storage for weeks before making it to the shelves.
You might feel quite virtuous when you arrive home with your bags of shopping packed with an array of foods that would impress any nutritionist. But is it realistic to think you can go all week without a treat? Probably not. To avoid caving mid-week and ordering in a takeaway, allow yourself a few indulgences. If you're eating a healthy, unprocessed diet 80% of the time, you can afford and enjoy the odd bar of chocolate or glass of wine!5. Skipping the canned foods aisle