The blood sugar concentration or blood glucose level is the amount of glucose (sugar) present in the blood of a human or animal. Normally in mammals, the body maintains the blood glucose level at a reference range between about 3.6 and 5.8 mM (mmol/L, i.e., millimoles/liter), or 64.8 and 104.4 mg/dL. The human body naturally tightly regulates blood glucose levels as a part of metabolic homeostasis.

Glucose is the primary source of energy for the body's cells, and blood lipids (in the form of fats and oils) are primarily a compact energy store. Glucose is transported from the intestines or liver to body cells via the bloodstream, and is made available for cell absorption via the hormone insulin, produced by the body primarily in the pancreas.

The mean normal blood glucose level in humans is about 4 mM (4 mmol/L or 72 mg/dL, i.e. milligrams/deciliter); however, this level fluctuates throughout the day. Glucose levels are usually lowest in the morning, before the first meal of the day (termed "the fasting level"), and rise after meals for an hour or two by a few millimolar. Normal Human Glucose Blood Test results should be 70 - 130(mg/dL) before meals, and Less than 180 mg/dL after meals.

John Anthony Frusciante ⁱ/fruːˈʃɑːnteɪ/; born March 5, 1970) is an American guitarist, singer, songwriter, record and film producer. He is best known as the former guitarist of the rock band Red Hot Chili Peppers, with whom he had been for a number of years and recorded five studio albums. Frusciante has an active solo career, having released ten albums under his own name, as well as two with Josh Klinghoffer and Joe Lally as Ataxia. His solo recordings include elements ranging from experimental rock and ambient music to New Wave and electronica. Influenced by guitarists of various genres, Frusciante emphasizes melody and emotion in his guitar playing, and favors vintage guitars and analog recording techniques.

Frusciante joined the Red Hot Chili Peppers at eighteen years old, first appearing on the band's 1989 album, Mother's Milk. The group's follow-up album, Blood Sugar Sex Magik (1991), was a breakthrough success. However, he was overwhelmed by the band's new popularity and quit in 1992. He became a recluse and entered a long period of drug addiction, during which he released his first solo recordings: Niandra Lades and Usually Just a T-Shirt (1994) and then Smile from the Streets You Hold (1997). In 1998, he successfully completed drug rehabilitation and rejoined the Red Hot Chili Peppers with the album Californication (1999). His album To Record Only Water for Ten Days was made in 2001. On a creative spree, Frusciante released six solo albums in 2004; each album explored different recording techniques and genres. In 2009, Frusciante released The Empyrean and again parted ways with the Red Hot Chili Peppers. As of 2011, Frusciante is currently working on his eleventh solo album. Frusciante has produced and/or recorded with the Wu-Tang Clan, The Mars Volta, George Clinton and others. His most recent solo releases will be a 5 song EP entitled Letur-Lefr, due out in July 2012, and a full length album entitled PBX Funicular Intaglio Zone, due out in late 2012.