No and no. You have higher nutritional requirements during pregnancy which the baby needs to be healthy.

Lactation--a newborn baby consumes more than a baby in utero.

The worst effect of not meeting nutritional needs during pregnancy is the early onset of osteoporosis, damage to the teeth, and hair loss for the mother. Other affects include birth defects and low birth weight.

Shonda Parker has written:

'The naturally healthy pregnancy' -- subject(s): Complications, Diet therapy, Herbs, Nutritional aspects, Nutritional aspects of Pregnancy, Pregnancy, Therapeutic use

Bonnie S. Worthington-Roberts has written:

'Nutrition in Pregnancy and Lactation' -- subject(s): Health education, In pregnancy, Lactation, Mothers, Nutrition, Nutritional aspects, Nutritional aspects of Pregnancy, Pregnancy