Final answer:
Final answer:
The correct statement about weight and pregnancy is that an average of 300 extra calories per day is recommended primarily in the last trimester. Dieting is not generally advised during pregnancy unless medically indicated, and the precise weight gain for an underweight woman would differ from that of a woman with a normal BMI and should be managed by a healthcare provider.
Step-by-step explanation:
None of the provided statements regarding weight and pregnancy is entirely correct. Weight management during pregnancy is crucial for the health of both the mother and the developing fetus. Extra caloric intake during pregnancy should only be about 300 calories per day on average, primarily during the latter stages of pregnancy. It is a myth that a pregnant woman should double her caloric intake. The additional 300 calories are meant to support the fetus's growth, especially in the last trimester.
Dieting to reduce weight is not generally recommended during pregnancy because it may deprive the fetus of essential nutrients. Every woman's weight gain targets will vary based on her pre-pregnancy weight and health. Underweight women coming into pregnancy should not gain the same amount of weight as those with a normal BMI; they might require more to support a healthy pregnancy. However, the extent of this is personalized and should be managed by a healthcare provider.
Obesity is not usually caused by hypothyroidism alone; it is often the result of an imbalanced energy intake and expenditure. Effective weight management strategies include a combination of diet and physical activity to achieve energy balance.