Many years ago (nearly 40) I was a biochemistry undergraduate at university. In our second year we had lectures on nutrition - from a biochemical point of view.
A couple of interesting points have stuck with me ever since
- The body manufactures its own cholesterol - it's an ingredient of cell membranes if I remember correctly
- If you compared a 'typical' dish from the 1950s home-made version, with the 1970s mass-produced version, the amount of fat was increased by a third.
The lecturer, told that with a diet low in processed foods, say from the 1950s, as a proportion of calorific content - not weight - the 1950s diet contained 30% of its calories as fat. So for 3,000 Cal a day, 1,000 came from fat. By the 1970s, with a greater amount of processed foods available and eaten the calories from fat would have been 40% ie for 3,000 Cal a day 1,200 calories would have come from fat. Much of this would be processed, trans-hydrogenated fats.
One summer, I had a holiday job in public analyst's laboratory. It was a real eye-opener.
A fruit drink has less fruit juice than 'fruit juice'
The minimum meat content for a meat pie is 25%, half of which can be fat.
A hamburger only has to be 80% meat (again only half of this has to be lean), so a 200g burger can legally contain 80g of lean meat, and 80g of fat (of any type)
Pork sausage is 65% meat, beef 55%.
The meat content for a meat+potato pie was 12.5%, many contained less, which is why they are now called potato+meat pies, which have no defined meat content.
This is all within the Sausage and other meat product regulations. It's really interesting/horrifying reading depending on your point of view.
Mechanically-recovered meat wasn't developed until the 1960s. I can remember the County Analyst, stomping around muttering "Louis bloody Edwards" - a former chairman of Man United here.
Food-labelling is really interesting, too.
Sorry if I've highjacked the thread, but quality of food is something I feel passionate about. I met my husband during that holiday job, so it's something we still talk about.