Kids less fit than their parent were (perhaps low vitamin D) – Nov 2013

Children’s cardiovascular fitness declining worldwide

American Heart Association Meeting Report: Abstract 13498 November 19, 2013

• Around the globe, children are about 15 percent less fit than their parents were when they were young.
• In the United States, kids’ cardiovascular endurance performance declined about 6 percent per decade between 1970 and 2000.
• Across nations, endurance has declined consistently by about 5 percent every decade.
• In a mile run, kids today are about a minute and a half slower than their peers 30 years ago.
• Researchers analyzed 50 studies on running fitness between 1964 and 2010 that involved more than 25 million kids, ages 9 to 17, in 28 countries.

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Vitamin D was not mentioned in the abstract

See also VitaminDWiki

• Sports benefits from up to 50 ng of Vitamin – meta-analysis - Nov 2012
• Muscles and Vitamin D - many studies
• Teens with higher levels of vitamin D were more fit in some ways– May 2013
• Teen obesity strongly associated with vitamin D deficiency – April 2012
• Delima: Most youths are vitamin D deficient – what to do – April 2012
• Children sicker now than in the past - 2007
• Teens increasingly indoors - especially if dark skin
• Incidence of 22 health problems related to vitamin D have doubled in a decade many charts

Overview Sports and vitamin D which has the following summary
Athletes are helped by vitamin D by:

1. Faster reaction time
2. Far fewer colds/flus during the winter
3. Less sore/tired after a workout
4. Fewer micro-cracks and broken bones
5. Bones which do break heal much more quickly
6. Increased VO2 and exercise endurance Feb 2011
7. Indoor athletes especially need vitamin D
8. Professional indoor athletes are starting to take vitamin D and/or use UV beds
9. Olympic athletes have used UV/vitamin D since the 1930's
10. The biggest gain from the use of vitamin D is by those who exercise less than 2 hours per day.
11. Reduced muscle fatigue with 10,000 IU vitamin D daily
12. Muscle strength improved when vitamin D added: 3 Meta-analysis
13. Reduced Concussions
    See also: Sports and Vitamin D category 282 items

Overview Obesity and Vitamin D low vitamin D also increases obesity. The Overview of Obesity has the following summary

• FACT: People who are obese have less vitamin D in their blood
• FACT: Obese need a higher dose of vitamin D to get to the same level of vit D
• FACT: When obese people lose weight the vitamin D level in their blood increases
• FACT: Adding Calcium, perhaps in the form of fortified milk, often reduces weight
• FACT: 168 trials for vitamin D intervention of obesity as of Dec 2021
• FACT: Less weight gain by senior women with > 30 ng of vitamin D
• FACT: Dieters lost additional 5 lbs if vitamin D supplementation got them above 32 ng - RCT
• FACT: Obese lost 3X more weight by adding $10 of Vitamin D
• FACT: Those with darker skins were more likely to be obese Sept 2014
• OBSERVATION: Low Vitamin D while pregnancy ==> more obese child and adult
• OBSERVATION: Many mammals had evolved to add fat and vitamin D in the autumn
  • and lose both in the Spring - unfortunately humans have forgotten to lose the fat in the Spring
• SPECULATION: Low vitamin D might be one of the causes of obesity – several studies
• SUGGESTION: Probably need more than 4,000 IU to lose weight if very low on vitamin D due to
    risk factors such as overweight, age, dark skin, live far from equator,shut-in, etc.
• Obesity category has 442 items

See also: Weight loss and Vitamin D - many studies   Child Obesity and Vitamin D - many studies   Obesity, Virus, and Vitamin D - many studies
Obese need more Vitamin D

• Normal weight     Obese     (50 ng = 125 nanomole)

Click here for 2014 study

Overview Deficiency of vitamin D has a chart showing decreases in past 40 years
Only half as many people had >30 ng of vitamin D 16 years later
Approximately 44% in 1988 but only 22% by 2004