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Category:BME and mitObesity

From Bioblast

Executive abstract

Work in progress by Gnaiger E 2020-01-20 linked to a preprint in preparation on body mass excess, BME and mitObesity.
The decline of muscular mitochondrial fitness in overweight states is a biomarker of the systemic mitObesity syndrome: Compromised mitochondrial fitness across metabolically active organs provides the mechanistic link between obesity and comorbidities such as diabetes, cardiovascular and neurodegenerative diseases and various types of cancer bound to redox imbalance, inflammation, oxidative stress and insulin resistance. Today mitObesity is the world-wide leading cause of deaths and early aging, which can be prevented by an active lifestyle and improvement of the quality of life by exercise and caloric balance.
Obesity is defined by convention of the WHO as a body mass index, BMI, equal or above 30 kg·m-2. The BMI has been critizised, however, as an indicator of obesity due to its poor correlation with body fat expressed as percent body fat mass per total body mass, BF%. Another fundamental limitation of the BMI as a general index of obesity is the fact that BMI cutoff points which have been evaluated in adult Caucasian populations are not generally applicable and have to be adjusted for Asian populations, where different BMI cutoff points are discussed for women and men, as well as for children and adolescents. A superior index of obesity is provided by the concept of body mass excess, BME, with respect to the healthy reference population: The BME (1) correlates linearly and tightly with body fat excess equally in women and men, (2) with BME cutoff points for overweight and obesity which are identical in a wide range of evolutionary (ethnic) background including European and American white Caucasians, American blacks, and Asian populations, and (3) with BME cutoff points that apply equally to adults, adolescents and children. The BME cutoff points for overweight and obese are easily understood by non-experts, as 20 % and 40 %, respectively, in excess of the reference body mass at a given height. In contrast, only specialists are familiar with the meaning of age-adjusted values of the BMI.
The decline of mitochondrial fitness in skeletal muscle is tightly associated with the body mass excess, BME, in healthy populations in the succession from the reference BME to overweight and obese BME-cutoff values. The decline of mitochondrial fitness is quantitatively related to the progressive loss of cariorespiratory fitness with increasing BME, measured as maximum ergometric aerobic capacity per total body mass, VO2max/M. The systemic decline of mitochondrial respiratory fitness is a hallmark of mitObesity.
Several drugst and nutraceuticals, which yield some promising results in the treatment of a diverse range of preventable degenerative diseases implicated in comorbidities, have common mechanisms of action targeting mitochondria. These drugs and neutraceuticals - such as metformin, melatonin, flavonoids, curcumin, and resveratrol - may be classified as anti-mitObesity bioactive compounds, providing strong evidence for the common mechanisms of action underlying the mitObesity syndrome.

Further details - MitoPedia: BME

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MitoPedia: BME

TermAbbreviationDescription
BME cutoff pointsBME cutoffObesity is defined as a disease associated with an excess of body fat with respect to a healthy reference condition. Cutoff points for body mass excess, BME cutoff points, define the critical values for underweight (-0.1 and -0.2), overweight (0.2), and various degrees of obesity (0.4, 0.6, 0.8, and above). BME cutoffs are calibrated by crossover-points of BME with established BMI cutoffs.
Body fat excessBFEIn the healthy reference population (HRP), there is zero body fat excess, BFE, and the fraction of excess body fat in the HRP is expressed - by definition - relative to the reference body mass, M°, at any given height. Importantly, body fat excess, BFE, and body mass excess, BME, are linearly related, which is not the case for the body mass index, BMI.
Body massm [kg]; M [kg·x-1]The body mass M is the mass (kilogram [kg]) of an individual (object) [x] and is expressed in units [kg/x]. Whereas the body weight changes as a function of gravitational force (you are weightless at zero gravity; your floating weight in water is different from your weight in air), your mass is independent of gravitational force, and it is the same in air and water.
Body mass excessBMEThe body mass excess, BME, is an index of obesity and as such BME is a lifestyle metric. The BME is a measure of the extent to which your actual body mass, M [kg/x], deviates from M° [kg/x], which is the reference body mass [kg] per individual [x] without excess body fat in the healthy reference population, HRP. A balanced BME is BME° = 0.0 with a band width of -0.1 towards underweight and +0.2 towards overweight. The BME is linearly related to the body fat excess.
Body mass indexBMIThe body mass index, BMI, is the ratio of body mass to height squared (BMI=M·H-2), recommended by the WHO as a general indicator of underweight (BMI<18.5 kg·m-2), overweight (BMI>25 kg·m-2) and obesity (BMI>30 kg·m-2). Keys et al (1972; see 2014) emphasized that 'the prime criterion must be the relative independence of the index from height'. It is exactly the dependence of the BMI on height - from children to adults, women to men, Caucasians to Asians -, which requires adjustments of BMI-cutoff points. This deficiency is resolved by the body mass excess relative to the healthy reference population.
ComorbidityComorbidities are common in obesogenic lifestyle-induced early aging. These are preventable, non-communicable diseases with strong associations to obesity. In many studies, cause and effect in the sequence of onset of comorbidities remain elusive. Chronic degenerative diseases are commonly obesity-induced. The search for the link between obesity and the etiology of diverse preventable diseases lead to the hypothesis, that mitochondrial dysfunction is the common mechanism, summarized in the term 'mitObesity'.
Healthy reference populationHRPA healthy reference population, HRP, establishes the baseline for the relation between body mass and height in healthy people of zero underweight or overweight, providing a reference for evaluation of deviations towards underweight or overweight and obesity. The WHO Child Growth Standards (WHO-CGS) on height and body mass refer to healthy girls and boys from Brazil, Ghana, India, Norway, Oman and the USA. The Committee on Biological Handbooks compiled data on height and body mass of healthy males from infancy to old age (USA), published before emergence of the fast-food and soft-drink epidemic. Four allometric phases are distinguished with distinct allometric exponents. At heights above 1.26 m/x the allometric exponent is 2.9, equal in women and men, and significantly different from the exponent of 2.0 implicated in the body mass index, BMI [kg/m2].
Height of humansh [m]; H [m·x-1]The height of humans, h, is given in SI units in meters [m]. Humans are countable objects, and the symbol and unit of the number of objects is N [x]. The average height of N objects is, H = h/N [m/x], where h is the heights of all N objects measured on top of each other. Therefore, the height per human has the unit [m·x-1] (compare body mass [kg·x-1]). Without further identifyer, H is considered as the standing height of a human, measured without shoes, hair ornaments and heavy outer garments.
Lengthl [m]Length l is an SI base quantity with SI base unit meter m. Quantities derived from length are area A [m2] and volume V [m3]. Length is an extensive quantity, increasing additively with the number of objects. The term 'height' h is used for length in cases of vertical position (see height of humans). Length of height per object, LUX [m·x-1] is length per unit-entity UX, in contrast to lentgth of a system, which may contain one or many entities, such as the length of a pipeline assembled from a number NX of individual pipes. Length is a quantity linked to direct sensory, practical experience, as reflected in terms related to length: long/short (height: tall/small). Terms such as 'long/short distance' are then used by analogy in the context of the more abstract quantity time (long/short duration).
MitObesity drugsBioactive mitObesity compounds are drugs and nutraceuticals with more or less reproducible beneficial effects in the treatment of diverse preventable degenerative diseases implicated in comorbidities linked to obesity, characterized by common mechanisms of action targeting mitochondria.
ObesityObesity is a disease resulting from excessive accumulation of body fat. In common obesity (non-syndromic obesity) excessive body fat is due to an obesogenic lifestyle with lack of physical exercise ('couch') and caloric surplus of food consumption ('potato'), causing several comorbidities which are characterized as preventable non-communicable diseases. Persistent body fat excess associated with deficits of physical activity induces a weight-lifting effect on increasing muscle mass with decreasing mitochondrial capacity. Body fat excess, therefore, correlates with body mass excess up to a critical stage of obesogenic lifestyle-induced sarcopenia, when loss of muscle mass results in further deterioration of physical performance particularly at older age.
VO2maxVO2max; VO2max/MMaximum oxygen consumption, VO2max, is and index of cardiorespiratory fitness, measured by spiroergometry on human and animal organisms capable of controlled physical exercise performance on a treadmill or cycle ergometer. VO2max is the maximum respiration of an organism, expressed as the volume of O2 at STPD consumed per unit of time per individual object [mL.min-1.x-1]. If normalized per body mass of the individual object, M [kg.x-1], mass specific maximum oxygen consumption, VO2max/M, is expressed in units [mL.min-1.kg-1].


Labels: MiParea: Respiration, mt-Biogenesis;mt-density, Gender, Exercise physiology;nutrition;life style, mt-Medicine  Pathology: Obesity 

Organism: Human 





MitoPedia:BME