The commonest reason behind an unpleasant problem like the one you have described is something as simple as indigestion! A lot of times, people do not pay attention to their diet. A diet that comprises strong smelling foods can also be instrumental in creating strong smells that emanate from the body. Whether this is with reference to strong and foul body odor, bad breath or even strong smelling gaseous discharges. If the person with the problem is a meat eater, this problem of foul odor will only be exaggerated. Meat tends to have a strong odor and once it goes into the body it results in strong odors for the person eating it as well. Other foods that can contribute to strong body odors are spices such as garlic, which also have a strong odor unto themselves. Onions can also lend to strong body odors. A digestive system that is not regularly flushed and cleansed out can also emit really strong body odors. Basically, the problem being faced by your boyfriend could be any of these listed here, or even a combination of them all. There are a few lifestyle changes that he would need to make in order to get rid of this embarrassing and unpleasant problem.
One of the best changes that he could make is to start with a system of cleansing and detoxifying the body about once a month. This, when done regularly, will not only lead to the disappearance of this smelly fart problem; it will also help him to maintain good health in general. He can follow a two-day program, wherein the first day will be spent drinking water and having fresh fruits, vegetables and juices only. The second day can also be spent on the same diet, unless there is the unpleasant after effect of a headache, which is entirely possible and also highly probable. In this case, it is advisable to reintroduce solids slowly to the diet. Take care that there is no meat eaten for the first 48 hours following this diet. This would mean that there should be no meat consumption for a full four days. If possible, it is always a good idea to stay off meat for a few days. Apart from this, he should also drink large quantities of water, which will help to alleviate gas. Avoidance of gas causing foods such as beans and preserved foods would help remedy the situation.