Margaret (Peggy) Wynn died on the 8th January 2010. She was the devoted widow of Arthur Wynn, and co-author of many nutritional papers. Several were pathfinders in perinatal nutrition. Through my years of knowing Peggy and Arthur, I always enjoyed my visits to Church View, and was wonderfully welcomed and supported with their knowledge of the subject but also with their writing skills.

Peggy's editing was always benign, but from this Oxford English graduate would appear the occasional red circle with the word 'ugly'! She had a heart-warming presence, and a heart too for the disadvantaged, to whom she was committed. Their classic titles include: A Fertility Diet for Planning Pregnancy; No nation can rise above the level of its women; and New evidence on the nutrition of British school children and conclusions drawn for school meals. Many were published in Nutrition and Health. Logic and science, skills in writing, drawing and speaking, were concentrated on safeguarding the health of people though overall care from before conception, including freedom from poverty, poor nutrition, and toxins - smoking, drinking, drugs, and pollution at work or home. To quote their philosophy: "It has been said that disaster races to meet men and women who wait for proof of danger. Safety depends on the presumption of risk. . .  Preconception care is primarily concerned with reducing or eliminating such risks." Many of their 22 papers can be found on their son Stephen's website.

Peggy was one of those people who work away in the background, cajoling and persuading the people in power to do the right thing for those who are not, and have none.

Born Margaret Moxon and brought up in Yorkshire, she was the first girl from Barnsley high school to go to Oxford University. Her encounters with the effects of poverty set her future direction. Just a few weeks ago she was telling visitors how she recalled being able to chat to her brother over the heads of the other children: "We were posh," she said. "They were miners' children, and so they were much shorter!"

In 1938, she married Arthur Wynn and the following year they published a book on which they had worked together, "England's Money Lords", a devastating attack on the aristocratic and business links of the Tory party published pseudonymously under the name Simon Haxey. Then, while Arthur worked to improve pit safety (becoming director of mining research and later a senior civil servant), Peggy addressed the health of mining families. "Childbearing was a woman's occupational hazard," she later told me. Peggy worried that so many women suffered from untreated conditions related to childbearing, and once recalled taking a group of middle-aged women on a coach trip during the second world war: "I asked the driver to stop at the top of the avenue because it was a lovely day, and I thought we would walk the quarter-mile to the house. These women were not elderly, but they were so infirm that many of them could not have managed it. I had to call the driver back."

Arthur died in 2001. Peggy leaves four children, eight grandchildren, four great-grandchildren and many friends.

Margaret (Peggy) Wynn, writer and campaigner, born 17 April 1913; died 8 January 2010 Photograph, and substantially this text, are attributable to The Guardian, and Angela Phillips.