We tend to lose muscle mass, so our abdominal muscles aren't as tight as they once were, and the loss of elastin and collagen in our skin allows gravity to have its way so skin starts to sag. Both can cause the waistline to expand.
Changes in body weight significantly correlated with changes in waist circumference, changes in hip circumference, and changes in body fat percentage. A decrease in body weight of 3 kg corresponded to a 3.45 cm decrease in waist circumference in men and a 2.83 cm decrease in that in women.
You've gained muscle.
So as you gain more muscle and lose fat, you change your overall body composition, which can result in a higher weight, but a smaller figure and better health. If the scale has inched up, but your waistline hasn't and you feel strong overall, don't sweat the pounds; they're increasing your power.
Mostly, losing weight is an internal process. You will first lose hard fat that surrounds your organs like liver, kidneys and then you will start to lose soft fat like waistline and thigh fat. The fat loss from around the organs makes you leaner and stronger.
Waist Circumference
If most of your fat is around your waist rather than at your hips, you're at a higher risk for heart disease and type 2 diabetes. This risk goes up with a waist size that is greater than 35 inches for women or greater than 40 inches for men.
For your best health, your waist should be less than 40 inches around for men, and less than 35 inches for women, although it may vary depending on race or ethnicity. If it's larger than that, you may want to talk with your doctor about what your next steps are, including losing weight.
Female*: more than 80 cm (31.5 inches) is increased risk; more than 88 cm (35 inches) is substantially increased risk. *Other risk factors such as ethnicity, individual risk factors, pregnancy, medical history and family history can affect your risk, regardless of your waist circumference.
So if you lose 1lb (0.45kg) a week you could hope to reduce your waistline by an inch after four weeks.
If you can keep your waist circumference to less than half of your height, you will reduce your risk for stroke, heart disease and diabetes. For people under 40, a waist to height ratio of over 0.5 can be critical, while for people between 40 and 50 years of age, the critical value is between 0.5 and 0.6.
Aerobic exercise is a key element when working on losing inches from the waist. Twists, bends, crunches and other core exercises are great at tightening and toning the waist, but nothing takes the inches off like aerobics.
Your first step in burning off visceral fat is including at least 30 minutes of aerobic exercise or cardio into your daily routine. Studies show that aerobic exercises for belly fat help to reduce belly fat and liver fat. Some great cardio of aerobic exercises for belly fat include: Walking, especially at a quick pace.
"In general, 1 to 2 pounds per week, or 4 to 8 pounds per month, is a safe and sustainable amount to lose," says Sarah Gold Anzlovar, M.S., RDN, LDN and founder of Sarah Gold Nutrition. "Some people may lose more than that in the beginning, but it's often a lot of water weight and not true fat loss."
Your blood pressure can drop if you also lose weight too quickly, which can be dangerous. Dehydration and electrolyte imbalance can also occur. Other side effects of quick weight loss include dizziness, constipation, hair loss, headaches, irritability, fatigue, and muscle loss.
Body-weight loss is usually noticed around the belly, waistline, and thighs first. This is because your body stores fat in different locations. For instance, men hold more fat around their belly, while women store it on their thighs and hips. Weight loss gradually starts with a reduction in belly size.
What should your waist measurement be? For men, a waist circumference below 94cm (37in) is 'low risk', 94–102cm (37-40in) is 'high risk' and more than 102cm (40in) is 'very high'. For women, below 80cm (31.5in) is low risk, 80–88cm (31.5-34.6in) is high risk and more than 88cm (34.6in) is very high.
A larger waist circumference is often caused by intra-abdominal visceral fat. Visceral fat is fat that develops between and around internal organs. This type of fat differs from "regular" fat that sits just beneath the skin and can be pinched.