People who ate these types of fish one to four times per week had a 28% lower risk of AF compared with those who ate fish less than once a month.

BBC: NEWS | Health | Fish prevents deadly heart rhythms

The price of things that you might buy every day such as bread or milk is more important than something you might buy less than once a month such as a haircut.

BBC: Inflation calculator: How does it work?

And women who had migraines with auras less than once a month (75 percent of the group) were more than twice as likely as migraine-free women to have a heart attack, and almost twice as likely to have had a heart procedure, such as bypass surgery.

CNN: Women's migraines linked to higher stroke, heart attack risk

Previous inflation calculators have asked how much the user has spent on each of the 12 categories in the past month, but that has presented problems such as many people not knowing the answers and also that things in many categories are bought less than once a month.

BBC: Inflation calculator: How does it work?

Select a time, preferably once a month but no less than once a quarter, to review your strategy.

FORBES: Strategy Ain't What it Used to Be

The categories include nonvegetarians and people considered semi-vegetarians, who eat meat more than once a month but less than once a week.

WSJ: Vegetarians Live Longer Than Meat-Eaters, Study Finds