this is very dodgy from the SMA site linked to:
"Do I have to change my diet if I?m breast feeding??
As long as your diet is healthy, balanced and varied, and you eat regularly, your body will be able to produce top quality, nourishing breast milk for your baby.
Have at least 5 portions of fruit and vegetables (fresh, dried, frozen, tinned or juiced) a day.
Drink lots of fluids ? at least 6 - 8 glasses a day.
Boost your energy levels with starchy foods such as bread, pasta, rice and potatoes.
Make sure there?s plenty of fibre in your diet, such as wholegrain bread and cereals, as some women experience bowel problems after having a baby.
Drink at least one pint of pasteurised milk a day (or use in puddings, custards, sauces and/or on cereals).
If you don?t like milk, increase your intake of dairy products: one carton of yoghurt or an ounce of hard cheese provides a similar amount of calcium to a third of a pint of pasteurised milk.
Eat at least two portions of lean meat, chicken, fish, eggs (well-cooked), beans or pulses a day.
Take a supplement containing 10 μg of vitamin D every day ? your healthcare professional will be able to give your more information about this.
Peanuts, if you or the baby?s father, or either of your families, have a history of allergy you may wish to avoid eating food containing peanuts while breast feeding.
Fish is a great addition to a healthy diet but limit oil-rich fish (such as salmon, mackerel, herring, fresh tuna or sardines) to two servings a week and avoid eating more than one portion a week of shark, swordfish and marlin.
Limit your intake of coffee, tea and cola as caffeine can pass into breast milk and upset your baby.
Keep alcohol intake to a minimum.
Don?t smoke."
implications are that you have to do all the above to make good milk
whereas the truth is that you would have to be severely malnourished for your milk to be less than adequate
breastmilk from a smoker is more protective for babies than formula milk
this kind of 'advice' really does put doubt in mothers' minds and seriously undermines breastfeeding imo