some research on low carb diets does show certain deficiencies (see
http://apjcn.nhri.org.tw/server/APJCN/volume12/vol12.4/fullArticles/crowe.pdf, specifically
p4 fro vitamins and p6 for calcium.
Also this :
http://www.aafp.org/afp/20060601/1942.html
The Nutrient quest thread also served to suggest that if the diets were typical, there was a risk of deficiencies.
I'm just going to look at calcium and fibre:
I agree with Dennis that calcium can be obtained from dairy foods, so there is no reason per se that a low carb diet should be low in it. (However, most people obtain adequate quantities from milk and yoghurt and often reduce these because of the lactose content. Cheese (if you have no concerns about the sat fat ) is I agree an excellent source. Some green veg have good quantiites, though that from spinach for example doesn't seem to be well absorbed
Here's a short list that might help people see if they are getting adequate amounts The average adult should aim to take in 700mg calcium each day. Post menopausal women more.
(ca mg/100gm)
Semi-skimmed milk 118
Low fat yogurt, plain 190
Cheddar cheese 740
Sardines, canned in tomato sauce 430
Pilchards, canned in tomato sauce 250
Sesame seeds 670
Almonds 240
Tofu, soybean curd 510
White bread 110
Dried apricots 92
Dried figs 250
Okra, raw 160
Curly kale, boiled 150
Kidney beans, canned 71 (list from a Waitrose leaflet!)
Fibre is I think very much more difficult to get adequate amounts. In the absence of wholegrains, and pulses, very large amounts of veg and fruit are needed.Just add up the fibre in 5 portions from the list below. According to Ally you need 25mg a day.
All portions are supposed to be medium sized and come from a list on
http://www.weightlossresources.co.uk/diet/high_fibre/dietary_sources.htm
(food, portion size mg of fibre)
Broccoli 85g , 2
Green beans 90g ,1.7
Cabbage 95g. 1.7
Carrots 60gm,1.5
Cauliflower 90g 1.4
Tomato 1. 0.9
Lettuce 30g, 0.3
Red Lentils 3 tbsp (90g) 1.7
Wholewheat pasta(cooked) 230g 8.1 (thats to me quite a big portion!)
potato with skin, 1 medium (180g) 4.9
Branflakes 4tbsp 4.2
Wholemeal bread 1 slice 2.1
Granary bread1 slice 1.5
Orange 1, 2.7
Apple 1, 1.8
Peach 1, 1.7
Banana 1, 1.1
Strawberries 100g, 1.1
Almonds 6 whole, 1
As Catherine says, the wider your choice of foods, the less likely you are to have shortages.