Convenience stores in Japan are seeking to tap into a health boom in an aging society, offering leaner meals and, in some cases, professional nutritional advice.

In mid-January, Lawson Inc. opened a pop-up shop in Marunouchi, a busy commercial district in central Tokyo, focusing on products that are low in carbohydrates for health-conscious businesspeople. Carbohydrate-rich foods include sugary snacks, rice and bread.

The store offers around 250 items, including bento box lunches, salads and beverages. Placards suggest nine meal combinations for specific types of customer. For example, one breakfast option for people who want to "work actively throughout the day" consists of a mixed sandwich, a green smoothie and a hard-boiled egg.