Unfortunately this reduces the debate to a very simplistic level. Why? Because we know that hunger, appetite, energy expenditure (i.e., metabolic rate), and even our propensity to be active are highly regulated by an increasing list of hormones and signaling molecules, not to mention our genetic inheritance (Bouchard 1994). Moreover these various factors interact with each other – for example: exercise stimulates hunger, calorie restriction increases hunger and decreases spontaneous activity (Keys 1950), calorie restriction reduces metabolic rate, and exercise plus calorie restriction markedly reduces metabolic rate (Phinney 1988).
"Protein is great for fat loss. It helps build and preserve lean muscle tissue and can increase the amount of calories you burn. It’s also a great source of energy that helps you feel fuller for longer, so you’re less tempted to snack. Good sources include chicken breast, tuna, eggs, milk and chickpeas. And if you’re finding it difficult to avoid snacks that are high in carbohydrates, try substituting them for protein shakes or bars. Remember also to opt for the lean sources of protein because some sources can be high in saturated fat."
Drinking plenty of water is essential for overall health, and is a great way to boost your weight-loss efforts. But if you’re getting your H2O from cheap bottled water, the bottle itself could pose a problem; Bisphenol A, commonly referred to as BPA, has been linked to obesity, and it’s still found in many cheap plastics. A 2011 Harvard study found that adults with the highest concentration of BPA in their urine had significantly larger waists and a chance of being obese than those without as much of the chemical in their systems. So if you must drink store-bought bottled water, check to see if the bottle is BPA-free. And whatever you do, don’t reuse the same bottle; constantly refilling the same plastic bottle can cause BPA to leak into the water.
Cut out ‘fat-bombs’ and bulletproof coffee. These are okay to consume for satiety, but if your goal is weight loss, too much fat will prevent your body from using its own fat stores for energy (refer to point above for more information). Just one bulletproof coffee may contribute nearly 50 grams of fat and almost 500 calories to your day. Imagine what a few cups of coffee, or several fat bombs, might do to your weight loss.
“If a client has come to me looking to lose 10 pounds, I would tell them to simply move. Move more, and more often. Walk or bike ride to class or work, even park further away from your location in the parking lot. Take the stairs or take a walk during lunch. You don’t have to spend hours every day in the gym sweating, but you do have to make a conscious effort to move more, and sit less. This works great because it doesn’t feel like work and you’re burning more and more calories throughout the day.” — Ajia Cherry, personal trainer and Founder at Functional Innovative Training
Women usually need fewer calories than men, especially as they age. That's because women naturally have less muscle, more body fat, and are usually smaller than men. On average, adult women need between 1,600 and 2,400 calories a day. As you age, you need to take in fewer calories to maintain the same weight. You can also keep your weight healthy by increasing how much physical activity you get.