When he arrived, there was a 7-Eleven just over the next mountain. He would sneak in when they closed and pig out on junk food. That's why his clothes were so torn and ragged. He had to make room for his enormous gut. Over the years, the 7-Eleven closed due to it losing money but Ernest was able to survive for many years on the fat he had built up. SG1 arrived just in time with delicious, wholesome, and healthy MREs for him to eat. He could barely walk or talk when they arrived, but after stuffing his gullet with a dozen or so MREs, he was feeling much better and was far more coherent. And they all lived happily ever after.