Obesity in childhood can add up to health problems often for life. In adults, overweight and obesity are linked to increased risk of heart disease, type 2 diabetes (high blood sugar), high blood pressure, certain cancers, and other chronic conditions. Research has shown that obese children are more likely to be overweight or obese as adults.
Overweight and Obesity-Related Health Problems in Adults:
Coronary Heart Disease: 
As your body mass index rises, so does your risk for coronary heart disease (CHD). CHD is a condition in which a waxy substance called plaque (plak) builds up inside the coronary arteries. These arteries supply oxygen-rich blood to your heart.
Plaque can narrow or block the coronary arteries and reduce blood flow to the heart muscle. This can cause a heart attack.
Obesity also can lead to heart failure. This is a serious condition in which your heart can’t pump enough blood to meet your body’s needs.
High Blood Pressure:
Blood pressure is the force of blood pushing against the walls of the arteries as the heart pumps blood. If this pressure rises and stays high over time, it can damage the body in many ways.
Your chances of having high blood pressure are greater if you’re overweight or obese.
Type 2 Diabetes
Diabetes is a disease in which the body’s blood glucose, or blood sugar, level is too high. Normally, the body breaks down food into glucose and then carries it to cells throughout the body. The cells use a hormone called insulin to turn the glucose into energy.
In type 2 diabetes, the body’s cells don’t use insulin properly. At first, the body reacts by making more insulin. Over time, however, the body can’t make enough insulin to control its blood sugar level.
Diabetes is a leading cause of early death, CHD, stroke, kidney disease, and blindness. Most people who have type 2 diabetes are overweight.
Abnormal Blood Fats
If you’re overweight or obese, you’re at increased risk of having abnormal levels of blood fats. These include high levels of triglycerides and LDL (“bad”) cholesterol and low levels of HDL (“good”) cholesterol. This will cause high blood pressure!
Osteoarthritis
Osteoarthritis is a common joint problem of the knees, hips, and lower back. The condition occurs if the tissue that protects the joints wears away.
Extra weight can put more pressure and wear on joints, causing pain.
Sleep Apnea
Sleep apnea is a common disorder in which you have one or more pauses in breathing or shallow breaths while you sleep.
A person who has sleep apnea may have more fat stored around the neck. This can narrow the airway, making it hard to breathe.
Gallstones:
Gallstones are hard pieces of stone-like material that form in the gallbladder. They’re mostly made of cholesterol. Gallstones can cause stomach or back pain.
People who are overweight or obese are at increased risk of having gallstones. Also, being overweight may result in an enlarged gallbladder that doesn’t work well.
Overweight and Obesity-Related Health Problems in Children and Teens:
Overweight and obesity also increase the health risks for children and teens. Type 2 diabetes once was rare in Canadian children, but an increasing number of children are developing the disease.
Also, overweight children are more likely to become overweight or obese as adults, with the same disease risks. Such as: high blood pressure, sleep apnea, heart disease and possibility of heart attacks and strokes!
Reproductive Problems:
Obesity can cause menstrual issues and infertility in women.
Cancer:
Being overweight or obese raises your risk for colon, breast, endometrial, and gallbladder cancers.
Stroke:
Being overweight or obese can lead to a buildup of plaque in your arteries. Eventually, an area of plaque can rupture, causing a blood clot to form.
If the clot is close to your brain, it can block the flow of blood and oxygen to your brain and cause a stroke. The risk of having a stroke rises as BMI increases.