"Every front has a back and every back has a front," said one of my teachers. "The bigger the front, the bigger the back."
Well that sort of seems logical right. You have not met a person yet who only had a front. There are always consequences to actions so the initial action is a front and what comes of it is a back. That is also true with food. In addition foods have a front and a back in what they offer. There are good attributes and lousy ones.
For example, if you eat some watermelon this weekend and enjoy its cooling benefits, it's low sugar content, it's vitamins A and C and potassium, you would think watermelon is all good. However if you are someone with weak digestion, it will make it weaker. If you have a damp condition it will make it more damp and you will suffer on the watermelon backside. Men, watermelon isn't so manly either. It can inhibit semen production.
Or lets look at broccoli. You might have been told how good broccoli is for you so you decide to eat some every day like insurance. After all it has twice the vitamin C as an orange and as much calcium as a glass of milk in just a single serving. The back side to broccoli is that if you eat too much of it, it can inhibit iodine absorption. This can lead to you feeling weak, tired, depressed and gaining some weight.
As you can see from these two examples that healthy doesn't mean just eating healthy foods. Healthy means balance and learning how to create that. If you eat too many sour fruits, you are likely to get a tummy ache. If that has happened to you when you were young, you are most likely mindful of how much you eat each season. If you have ever fasted, you might have binged sometime after. There is always a front and a back. Get balance and then things get easier, your energy soars, your moods are stable and you can think from a whole new perspective and create your life to be better each day.