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www.reference.com/article/factors-affect-metabolism-858e0c74d6a7e1e5

Body size, weight gain, age, gender and hormones can affect metabolism, according to WebMD. People can control some of these factors and increase metabolism. "Metabolism" refers to how quickly the body utilizes energy.

www.reference.com/article/temperature-affect-metabolism-4a6d1bd2a5f7ae59

Physical activity increases body temperature; increased body temperature raises metabolism. A person who is exercising burns more energy (or calories) than someone sitting at a desk.

www.reference.com/article/metabolism-mean-ddb492db7b48cf28

According to the Merriam-Webster dictionary, "metabolism" is defined as the chemical process a plant or an animal uses to create energy needed for survival. Metabolism is responsible for everything from digestion to breathing and muscle movement.

www.reference.com/article/good-metabolic-rate-56372e7c4b841b9e

A good metabolic rate balances the intake of diet by an individual with his total daily energy expenditure. The TDEE, or maintenance level, represents normal daily activities and physical exercise. The maintenance level and basal metabolic rate helps an individual to adjust his diet, and balance his

www.reference.com/article/cell-metabolism-6602b81ad2920de4

Cell metabolism involves several complex biochemical reactions that occur in living organisms to maintain a normal life. These metabolic pathways are broadly classified as anabolism and catabolism.

www.reference.com/article/first-pass-metabolism-688dff37416b672c

Drugs.com defines first-pass metabolism as the intestinal and hepatic degradation or alteration of a drug or substance taken by mouth after absorption that removes some of the active substance from the blood before the substance enters the general circulation. The National Institute of Alcohol Abuse

www.reference.com/article/metabolic-disorder-fd42a030cbecc601

A metabolic disorder is when abnormal chemical reactions in the body disturb the metabolic process, states MedlinePlus. The metabolic process, or metabolism, is the process by which the body converts food into energy, states Healthline. The body breaks down nutrients in food using enzymes and then t

www.reference.com/article/foods-speed-up-metabolism-7c5d14c8b0f57c26

Foods that speed up metabolism include spicy foods and protein-rich foods, according to WebMD. Other foods that speed up metabolism are whole grains, cruciferous vegetables and berries, states the Huffington Post.

www.reference.com/article/peanut-butter-affect-metabolism-23b95f00c3347e64

The unsaturated fats, protein, manganese and niacin in peanut butter provide a healthy boost to metabolism, reports SFGate. Eating peanut butter with breakfast and snacks increases metabolism and provides a feeling of satiety that helps people stave off hunger and avoid becoming overweight, explains

www.reference.com/article/metabolic-wastes-6593209d775f5df1

Metabolic wastes, also known as excretes, are substances produced by the metabolic activities of living organisms. These substances cannot be used by the organism and are therefore excreted. These excretes include carbon dioxide, nitrogen compounds, sulfates, phosphates and water.