Water is tricky stuff. It can be limpid and clear but dangerous, home to harmful bacteria and parasites. It can be murky, but perfectly safe to drink. It may smell of chlorine, which puts people off, but perversely that is a sign that no bacteria are present.

So how do we judge the quality of water? That’s the subject of a new book — The Taste of Water — by Christy Spackman at Arizona State University. She looks at the history of water purification and efforts to understand the complex interplay between the quality of water from a public health standpoint and the sensory perceptions that people use (or don’t use) to decide whether they trust it.

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Cheap supermarket meat has been making life difficult for independent butchers for quite some time now. England has lost 60 per cent of its butcher shops in the past few decades, Australia 80 per cent. I couldn’t find figures for the United States. Against that background, there has been an uptick of interest from young people wanting to learn the skills needed to deconstruct an animal carcass. What surprised me – and of course it shouldn’t have – is that women are learning butchery. I chatted with three of them.

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We all know we’re supposed to reduce our food waste, but what exactly is the difference between waste and leftovers? For me, leftovers become waste when they turn green and furry, forgotten at the back of the fridge, but that’s a very narrow view. Eleanor Barnett is a historian whose book Leftovers: a history of food waste and preservation takes a much broader look at food scarcity, food surpluses and the byproducts of food production that people don’t or won’t eat. Our conversation reflected on the complex relationships among food waste, human behaviour, and systemic factors throughout history, advocating for a renewed appreciation of the value of food.

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One of the key activities in an observant Jewish household’s preparation for Passover is the hunt for and destruction of chametz, anything that involves leavened grain. At one level, the search means that the house gets an extremely thorough cleaning at least once a year. At another, there are associations that equate ridding the house of chametz with ridding the mind of ego and other spiritual concerns. But what exactly is chametz? In trying to get to some sort of “truth” I discovered that there can be no right or wrong answer, only opinions, more or less persuasive, more or less accepted. In the end, the meaning of chametz rests on history and tradition, and new traditions are possible.

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The last supper was a Passover Seder, and for two thousand years Passover and Easter have been linked. The links, however, are complex, which is why I am taking the opportunity to expand on a five-year-old episode.

The rituals of the Passover dinner have been in place for thousands of years, although always open to interpretation and evolution. And yet, although different Christian traditions have their ritual Easter foods, there don’t seem to be any universals. The episode looks at these two contrasting aspects of ritual foods.

First, I talked to Susan Weingarten talks about the Seder dinner and especially an item essential on the Passover table that is not mentioned in God’s original instructions for the last supper of the Israelites in Egypt. While nobody knows how it came to be, every Jewish culture has its own version of haroset and its own idea of what it means.

This copy of Edna Holmgren’s recipe is not quite the original. Lois Long told me that “the flour in the cinnamon sugar mixture was Pillsbury’s idea. I cut it down to 1 tbsp but I don’t like it. The original recipe has no flour.” I do wonder what it is there for. Possibly to soak up melting gooeyness, because many of the comments on the Hall of Fame website are complaints about the mess if the pastry isn’t very carefully sealed.

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Malta, just off the coast of Sicily in the middle of the Mediterranean, has always been of enormous strategic importance. As a result it has been claimed, and fought over, by empire after empire. Each time it was vulnerable to a blockade of essential food supplies because the tiny island — Malta is only 27 kilometres long — cannot possibly feed itself. Despite this history, going into World War II neither the British colonial government nor the Maltese people were prepared for the inevitable blockade. When rationing was imposed, however, the authorities deliberately turned a blind eye to those who were finding ways to evade the restrictions of the black market. It made sense to do so, as I heard from Maltese historian Noel Buttigieg.

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Spina bifida is a neural tube defect that is one of the most common severe birth defects in the world. The main cause is a lack of folate vitamin in the diet, and in 1991, the UK’s Medical Research Council halted a trial of folic acid supplementation early because it was obvious that the supplement was preventing a large number of cases. At the time, the trial’s authors concluded: “public health measures should be taken to ensure that the diet of all women who may bear children contains an adequate amount of folic acid.”

The United States was relatively quick to act, mandating flour be fortified with folic acid in 1998, followed by around 80 countries worldwide. Countries with mandatory fortification have seen a drop in neural tube defects of between one third and one half. But not the European Union nor, until recently, the United Kingdom.

The European Union concedes: “There has been no real progress in preventing NTDs in Europe since folic acid supplementation was shown to be an effective preventive measure.”

Finally, the UK has put forward proposals to fortify white flour, but many doctors say they could do much more. Europe is still to act.

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That’s the conclusion of a massive study of more than 1000 pot fragments by 30 scientists. Harry Robson, one of the team leaders, explained the results and the light they shed onto the transition to farming.

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In the 1950s and 1960s, the paediatric establishment in America convinced mothers to start solid foods in the first month of baby’s life, and sometimes even before they had left the hospital. This was considered a good idea even though the average baby wouldn’t have a tooth in its head for another five or six months. Amy Bentley, a professor at New York University, has charted the rise and continuing rise of baby food, from its earliest emergence in upstate New York and Michigan to its proliferation today. Commercial baby foods made sense, she thinks, as a safer and more convenient alternative to home-made options, and still today may form the bedrock of the best-nourished period of a child’s life. But they also reflected an American exceptionalism rooted in the triumph of World War Two.

The adorable infant in Gerber’s advertisements was originally a pencil sketch that the artist said she would finish in colour if selected. Gerber preferred the sketch, and “repeated requests” prompted the company to offer a reproduction, suitable for framing, in exchange for 10¢. Strangest of all, some people seemed to think the baby was Humphrey Bogart, who was 29 qwhen the sketch was made. A little old for baby food.

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