The concern about eating too little is that the metabolism slows to compensate, in anticipation of a famine: it's on that basis that you'll hear that you should hit your calorie target.
An alternative view is that what we eat is far more important than any calorie total. It's a fallacy that 'a calorie is a calorie': different foods have very different effects on the body.
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This is stuck in my brain regarding calorie intake when I calorie counted in my other 'diets' I was told its extremely important that you have the required calories or you wont lose weight.... seems i need to kick that voice right out!!
In that case I shall concern myself less in calories and more on enjoying my new healthier lifestyle!
I don't think that you will find many of us here telling you to eat past your body's own appetite level. As long as you are eating healthy food until you are no longer hungry, I would have thought that was the ideal thing to do.
However, I have never done a lot of running, you might need more fuel on the day perhaps, but I am sure that there are people on here who are more athletic than I am and who are more able to help in that case. Your own body fat should be used as fuel I would think, but don't take my word for it, others will be better able to advise on that one.
If you look at it another way, you need vitamins and minerals to stay healthy, and most of those are in vegetables. Vitamin K2 controls how calcium is stored in the body. If you don't have enough the calcium goes to the arterie and vein walls instead of the bones, resulting in cardiovascular problems and osteoporosis in later life. You'll get vitaminK2 in dark leafy greens like kale. Kale also contains as much if not more vitamin C as oranges, so you can forget the regular juice with your breakfast and avaoid the fructose which contributes to weight gain and many other medical problems like gout. Other veg will provide most of the other vitamins and minerals. The rest will come from meat, especially offal which is very nutrient dense. If you can't stand it on its own, mix a little with other meats to make casseroles, meatballs etc.
By the time you've made sure that you're eating enough veg, you won't have room for the bad high carb foods.
If you are eating all your body asks for, it's not going to think there is a famine.
I have experienced exercise unnaturally curbing appetite to the point I wasn't fuelling enough, but that was way more exercise than c25k. Even if it suppresses it for a few hours, you will get hungry later if your body thinks it needs it.
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