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BBC - how your weight affects your fertility
BBC - how your weight affects your fertility
14:38 - 08.02.2012

How your weight affects your fertility
If you're very underweight, it can be more difficult to conceive. Being very overweight may also cause problems, especially if you also suffer from polycystic ovary syndrome. Being overweight and pregnant also increases the risk of complications during pregnancy, birth and in the few days after the birth.
The ideal weight range is usually calculated using the body mass index (BMI). A BMI of between 18.5 to 25 is a healthy weight for most people and associated with relatively low risks. For people with a BMI over 30, even a small weight loss can greatly increase your ability to conceive and have a healthy pregnancy.
So, take steps either to lose or gain weight in a sensible and sustainable way before you become pregnant. Crash dieting is not good for your health, and limiting your range of foods may mean you go short of important nutrients. If you're concerned about your weight, you may find it useful to speak to your doctor or practice nurse for further advice. They can refer you if necessary to a specialist dietitian.

What is a healthy diet during pregnancy?
With a few exceptions, you can continue to eat normally before and during pregnancy. A healthy diet includes regular meals and snacks, and a healthy eating regime contains:
Plenty of starchy carbohydrates - bread, rice, pasta, breakfast cereals, chapattis, couscous and potatoes.
Plenty of fruit and vegetables - at least five portions a day.
Low or reduced fat dairy products such as milk, yoghurt, fromage frais and pasteurised cheeses.
Lean sources of protein, such as meat, poultry, fish, eggs (well-cooked), beans and pulses.
Not too many fat-rich and sugary foods.
At least eight medium glasses of fluid each day.
Very little or no alcohol.

Your needs for calcium double during pregnancy, and are particularly high during the last ten weeks when calcium is being laid down in your baby's bones. Your body adapts to absorb more calcium from foods eaten, so you don’t actually need to eat more of it in late pregnancy, as long as it's present in your diet anyway.
Continue to ensure your diet has milk and dairy foods such as cheese, yoghurt and fromage frais. Official advice is to have three servings every day – and typical servings include a glass of milk, milk with cereal, a small matchbox size chunk of hard cheese or a small pot of yoghurt (125g to 150g). Other sources of calcium include bread, green vegetables, canned fish with soft, edible bones (salmon, sardines and pilchards), dried apricots, sesame seeds, tofu, fortified orange juice and fortified soya milk.
Vitamin D is essential for forming and maintaining healthy bones and teeth. It's found in only a few foods, including fortified margarines and reduced-fat spreads, some fortified breakfast cereals, oily fish and meat. A small amount can also be found in milk and eggs. The body also makes vitamin D when the skin is exposed to sunlight.

Source: http://www.bbc.co.uk/health/physical_health/pregnancy/pregnancy_diet.shtml