Low t at 30

A country's birthrate is among the most important measures of demographic health. The number needs to be within a certain range, called the “replacement level,” to keep a population stable so that it neither grows nor shrinks. If too low, there's a danger that we wouldn't be able to replace the aging workforce and have enough tax revenue to keep the economy stable. Countries such as France and Japan that have low birthrates have put pro-family policies into place to try to encourage couples to have babies. The flip side can also be a problem. Birthrates that are too high can strain resources such as clean water, food, shelter and social services, problems faced by India, where the fertility rate has fallen over the past few decades but still remains high.

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Sixty participants (82%) in the low-fat group and 59 (79%) in the low-carbohydrate group completed the intervention. At 12 months, participants on the low-carbohydrate diet had greater decreases in weight (mean difference in change, − kg [95% CI, − to − kg]; P  = ), fat mass (mean difference in change, −% [CI, −% to −%]; P  = ), ratio of total–high-density lipoprotein (HDL) cholesterol (mean difference in change, − [CI, − to −]; P  = ), and triglyceride level (mean difference in change, − mmol/L [− mg/dL] [CI, − to − mmol/L {− to − mg/dL}]; P  = ) and greater increases in HDL cholesterol level (mean difference in change, mmol/L [ mg/dL] [CI, to mmol/L { to mg/dL}]; P  < ) than those on the low-fat diet.

Low t at 30

low t at 30


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