Soda and other sugary soft drinks are all empty calories that may result in weight gain and health problems. Don’t be fooled—diet soda is not better. It’s full of artificial sweeteners, preservatives, and often caffeine that can disrupt your health.31,32 It can interfere with your hunger hormones, increase your appetite, and lead to weight gain.33,34 Herbal teas and green juices are a good option.
There appears to be a connection between estrogen and body weight regulation.  With lower estrogen levels, lab animals tend to eat more and be less physically active.  Levels that are too high or too low appear to lead to fat storage.  And, lower estrogen levels may also slow down your metabolic rate (the speed  at your body converts stored energy into working energy).
Sarah Mirkin, RDN, author of Fill Your Plate Lose the Weight, recommends 20 to 30 grams of protein per meal. "It’s important to take in that amount of protein at all your meals, and ideally include high protein snacks as well," Mirkin says. "This helps to prevent lean muscle protein breakdown that decreases muscle mass percentage, increases fat percentage, and slows the metabolic rate. Muscle burns calories. Fat doesn’t."
As you enter your forties, you are also entering perimenopause, when levels of your sex hormones progesterone and estrogen decline. Besides regulating your menstrual cycle and reproductive functions, these hormones also impact restful sleep and relaxation. A decrease in progesterone and estrogen levels may lead to sleep disturbances, restlessness, and insomnia.1 Because changes in sleep patterns have been associated with weight gain, sleepless nights may make weight loss increasingly difficult.2
Developing good sleeping habits is crucial when it comes to weight loss.40 The exercise and dietary tips with discussed earlier can support your sleep cycle. Avoid sugary and caffeinated foods, especially as the evening approaches, so you can feel tired and calm, instead of jittery. Limit blue-light exposure in the evening by wearing amber glasses that block harmful wavelengths from electronics. Develop a night-time routine that calms you down before bedtime.
Exercise can actually increase your energy. Just three hours of exercise weekly can improve the health of menopausal women.35,36,37,38,39 You may be able to add aerobic exercise into your everyday life without even noticing it! Take a walk during lunch with your colleagues. Go for a bike ride with your family after dinner. Put some music on while cleaning the house and add some dance moves. Jump on an elliptical trainer or treadmill instead of sitting while watching your favorite show.
Your metabolic rate naturally continues to decline 5 percent each decade once you hit 40.3 Your resting metabolic rate (RMR) determines how many calories you just to survive. It is determined by a variety of chemical reactions inside your body. These reactions rely on your mitochondrial function and sodium-potassium pumps. Your mitochondria help to create energy, while your sodium-potassium pumps generate muscle contractions and nerve impulses.4,5,6,7,8 Both of these processes become less effective over the years and slow your metabolism.9,10 If you eat more than your RMR yet lead a sedentary life, you set yourself up for weight gain.
If you're genetically predisposed to gain weight easily, that may be another strike against you. Even if you don't actually gain weight, you may still gain inches around the waist. This weight gain can be so frustrating, it's easy to become obsessed with losing it, starving yourself or exercising too much or maybe even looking into the latest plastic surgery procedure.
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