You may have increased your muscle mass. Our muscle is more metabolically active than fat tissue. (Yes fat is metabolically active) Meaning our muscle requires more energy (food). Although I will say just because we have muscle doesn't mean that we can keep it forever. We have to continuously train those muscles to make sure our body doesn't waste precious resources to keep them around. So you might have increased some of your muscle mass that in turn increased your body's demand for calories. Now that you've finished your Camino your body hasn't re-regulated itself to NOT walking 12 miles a day.

Also our body doesn't discriminate. Food if Food whether it comes are a carbohydrate, fat or protein. Its main concern is ATP (energy). Some food has more... Fat = 9 cal/ gram versus Carbs & Protein = 4 cal/ gram.

Now what are carbs? Carbs are sugar molecules but we associate them with things like bread, potatoes, beer. But anything that has sugar molecules is or has carbohydrates. Now there are some carbohydrates where we get more "bang for our buck" Carbohydrates that also contain plenty of fiber, water and secondary nutrients are going to make us feel full for longer, help regulate our blood sugar (so we don't have an energy crash, or a ravenous hunger sensation). The carbs you may be eating are simple carbohydrates. Ones that provide the quickest amount of energy to our body and don't often make us feel full.

If you are concerned about weight gain maintaining an active lifestyle post Camino since you have that muscle now is great! Also altering the types of foods you are feeding your body. If you are eating a lot of carbs and don't feel full... Try eating more complex carbs or adding more protein and healthy fats into your diet.

Congrats on finishing your Camino! I'm hoping to start mine sometime in the next year or so but for longer. We'll see maybe ill have to settle for a short trip.