Throughout history man has had to accept the that all living things must die. But people now live longer than they     ____. Yet, all living things still show the________of aging, which will eventually ______ death.

Aging is not a disease, but as a person passes maturity (成熟期), the cells of the body and the ____ they form do not function as well as they ______ in childhood and teenage years. The body provides less ______ against disease and is more _______to have accident.

A number of related causes may________aging. Some cells of the body have a fairly long life, but they are not     _____when they die. As a person ages,________of brain cells and muscle cells decreases. ______ body cells die and are replaced by new cells. In an aging person the_______cells may not be as workable or as capable ______ growth as those of a young person.

Another ______ in aging may be changes within the cells ______ . Some of the protein chemicals in cells are known ______ with age and become less elastic (有弹性的). This is why the skin of old people wrinkles (皱纹) and     ____. This is also the reason why old people________in height. There may be other more important chemical changes in the cells. Some complex cell chemicals, such as DNA and RNA, store and________information that the cells need. Aging may affect this______and change the information-carrying molecules so that they do not transmit the information as well.

Fitness apps such as Strava can be useful tools for motivating you to start and stick to an exercise plan. But, according to a study at the National University of Ireland, Galway, these apps can make people become _______to exercise. The study, which observed 272 cyclists who use Strava, found that people who mainly use the tool to show off, _______, posting their exercise to receive praise, are more likely to develop an unhealthy desire and high stress levels.

It seems obvious that being able to track and share the tiniest details of your exercise may not always be a(n) _______thing. I had an eating disorder as a teenager and, for a very unhappy time, _______dominated my life. I weighed myself several times a day. I calculated everything from how many calories were in one bite of an apple to how many extra calories I would _______by exercising in cold weather. I used in-brain calculating technology to track all this. Had I had access to the health apps available now, it would have taken me much longer to _______– not only because these kinds of tools enable obsessive (强迫性的)behaviour, but because they _______and even glorify it.

We live in an age when you can never be too rich or too _______. Calorie-counting is now celebrated as a data-driven route to self-improvement. It is _______to spot the symptoms associated with eating disorders when everyone seems to get hooked on their fitness statistics. Also, because eating and exercise disorders are still associated with women, it is particularly easy for problematic behaviour among men to fly under the radar.

The negative connection between these technologies and wellbeing has received ________attention. Only a handful of studies hint at the dark side of these devices. A 2019 study of female Fitbit users by CNN, for instance, found that 59% felt as if their routines were ________by their device, while 30% said their Fitbit made them feel guilty. A 2015 study at Duke University found that tracking can reduce ________in the activity being quantified and make people do less of that activity when they are not measuring it. Going for a long bike ride can cease to be an enjoyment in itself but an achievement to ________about online.

Fitness apps themselves are not a bad thing. ________, as health-tracking technology becomes increasingly common – even kids use fitness apps – it is important to be aware that ________every aspect of our lives is not necessarily healthy.

A new study has found evidence of aggressive behavior in children who drink four or more servings of soft drinks.every day._______for the study came from the mothers of 3,000 5-year-olds.

Researchers asked the women to keep a_______of how many servings of soft drinks their children drank over a two-month period. The women were also asked to_______a checklist of their children’s behavior.

Shakira Suglia worked on the study with researchers from the University of Vermont and Harvard University School of Public Health. She says they found that children who drank the most soda were more than two times as likely as those who drank no soda to show_______of aggression.

“For the children who_______four or more soft drinks per day, we see an association between aggressive behaviors, attention problems and withdrawn (孤僻的) behaviors.”

The aggressive behaviors included destroying possessions_______others, taking part in fights and_______attacking people.

Shakira Suglia says the researchers identified the_______after they.considered sociodemographic (社会人口的) factors like the child’s age and sex. They also considered other possible influence,_______whether the boys and girls were eating sweets or taking fruit drinks on a normal day. In addition, the researchers examined parenting styles and other social conditions that might be________in the home.

Doctor Suglia says it’s not________why young children who drink a lot of spda have behavior problems.

“We can’t prove that this is a direct________relationship, having said that, there are a lot of ingredients in soda, a lot of ingredients that have not.been examined in relation to behavior.”

A________often found in soft drinks is caffeine, which helps to make people feel energized.

Doctor Suglia suggests that caffeine could be causing the 5-year-olds to be more aggressive. The research is part of a large study called the Fragile Families and Child Wellbeing Study, which________5,000 poor mothers and their children in 20 American cities.

Earlier studies of young adults have found the highest sugar levels in those who carry weapons and show signs of________social behaviors.