Day 4 was by far the worst for me - but I made it, and I feel like if I can make it this far - ANYONE can do this.
Here's some food for thought to keep you going:
"Just as our homes are made from lumber without looking like trees, our bodies are made from the nutrients we extract from foods without resembling those foods. The nutritional content of what we eat determines the composition of our cell membranes, bone marrow, blood, and hormones. Consider that the average adult loses roughly 300 billion cells to old age every day and must replace them. Our bodies are literally manufactured out of the food we consume."