Below you will find scientific investigations into the relationship between nutrition and obesity.

The review articles (meta-analyses) of randomized, placebo-controlled double-blind human studies (Rcts) answer the following question:
"Is swallowing food supplements make sense?". Yes at a positive conclusion and no in the case of a negative conclusion.

The review articles (meta-analyses) of cohort studies or case-control studies answer the following question:
"Should I change my diet?".

Research Question:
Or vitamin C a protective factor for age-related cataract is, remains unclear. It was therefore carried out this review article.

Vitamin C lowers the chances of getting age-related cataract (cataracts)?

Study Design:
This overview article contained 20 studies on vitamin C intake and 10 studies on serum ascorbaatgehalte (= the vitamin C content in the body). 

Research Question:
Swallowing garlic supplements lowers the blood pressure?

Study Design:
This overview article contained 17 Rcts.

Results and conclusions:
The researchers found that garlic supplements the systolic blood pressure significantly with 3.75 mmHg [95% CI =-5.04 to-2.45, I2 = 30.7%, p 0.001] reduced.

The researchers found that garlic supplements the diastolic blood pressure significantly with 3.39 mmHg [95% CI =-4.14 to-2.65, I2 = 67% p 0.001] reduced.

Research Question:
Women with gestational diabetes have less selenium in the body?

Study Design:
This overview article contained 6 observational studies with 147 women with gestational diabetes and 360 women without gestational diabetes.

Summary:
The researchers found in an overview article of 12 prospective cohort studies with 672389 57641 deaths among participants, that eating a lot of fish the chance of death to all causes significantly with 6% reduced.

Research Question:
Although fish consumption impact on chronic disease-related mortality, the relationship between eating fish and all-cause mortality inconsistent. It was therefore carried out this review article.

Lowers the chance of eating fish death to all causes (all-cause mortalieit)?

Research Question:
Improves swallowing DHA the memory of the elderly?

Study Design:
This overview article contained 15 intervention studies (with an average duration of 4-6 months. The age of the participants was above 45 years) and 13 observational studies. 

Results and conclusions:
The researchers found that swallowing of DHA with or without EPA increased significantly [p 0.004] the episodic memory of people with mild memory problems.