Energy balance
Sustained calorie restriction (1750–2100 kcal/day) in healthy, non-obese humans significantly improves cardiovascular and metabolic biomarkers, including reducing BMI, blood pressure, fasting insulin, glucose, and cholesterol, while maintaining excellent physical and mental health.
To improve metabolic health, you can adopt a calorie-restricted diet focused on nutrient density. Aim for 1750-2100 kcal daily, prioritizing complex carbohydrates, vegetables, and fruits, while ensuring you get adequate protein and essential vitamins. This approach has been shown to significantly lower BMI, blood pressure, insulin, and cholesterol in healthy adults without compromising physical or mental performance, provided the diet is well-planned and nutrient-rich.
The data show that physiologic (e.g., body mass index, with a decrease of 19% for men and 13% for women; blood pressure, with a systolic decrease of 25% and a diastolic decrease of 22%), hematologic (e.g., white blood cell count, decreased 31%), hormonal (e.g., insulin, decreased 42%; T3, decreased 19%), biochemical (e.g., blood sugar, decreased 21%; cholesterol, decreased 30%)... changes resembled those of rodents or monkeys maintained on a calorie-restricted regime.
Why this rating
Small sample size (n=8) and lack of a concurrent control group (using historical/exit data as control), though the within-subject design and long duration (2 years) mitigate some risks.
Source
Calorie Restriction in Biosphere 2: Alterations in Physiologic, Hematologic, Hormonal, and Biochemical Parameters in Humans Restricted for a 2-Year Period
Roy L. Walford et al. · The Journals of Gerontology Series A · 2002
DOI 10.1093/gerona/57.6.b211
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