This message first of all is a marketing exercise, mostly put out by those food manufacturers who want you to consume their junk products. They want you to associate these foods as treating yourselves, or being the rebel by being just a 'bit' naughty, the thing is when I was a child these foods really were treats, and were for hi days and holidays. They were homemade by my mum, with wholefoods, with ingredients that were pronounceable, and still recognisable as food, we didn't have them everyday, and we didn't expect them everyday either no matter how many times we asked for them.
Now I see people 'treat' themselves with junk food everyday, often this is for just getting through the day! A bar of chocolate in the afternoon, a raspberry muffin for breakfast, a large coffee with syrup on the way to work, and a takeaway on the way home because it's been such a long day etc.
Ok is having a treat once in a while that bad for you? Firstly can I ask you, is it really once in a while, because I find it isn't as rare as that, it is normally daily or weekly. To be honest let me come back to a key question, what do you want your health to be like? Stop and ask yourself this question, because only by determining that will you know if it matters to have the odd junk food treat in a while. It only matters if you want to have excellent health, energy, vitality for life, and if you want to live a long life. No amount of junk food with chemical ingredients will give you a long healthy life, they don't give you energy, and they certainly don't give you any vitality.
Many of you will know that consistency in how you do something makes a huge difference to your long term success. So your health success depends on how often you consistently put your wholefood diet to one side to 'treat' yourself. Just consider the treat for a moment, sugary confectionary will create chaos with your hormones, and removes calcium from your bones, fried food will create arterial plaque, and inflammation, that Chinese takeaway with MSG has given you neurological damage. Eating junk food leaves your body in nutritional deficit, and you can't recover from it, yes you can reverse some of the impact, but once you have created the deficit the affect is cumulative.
The less you compromise your health, the more your body will repay you in both the long and short term. Your immunity will rise, you will become stronger, and more energised, do nothing in moderation that will jeopardise having excellent health.