How to Lose Belly Fat: A Practical Guide

How do you actually lose weight?

Losing weight is a hugely common New Year's resolution. It usually lasts about a week before fading out with little to show for it. So how do you avoid the most common pitfalls and actually get results?

Most reduction diets work by restricting calorie intake. The problem is that if that restriction stays flat for too long, the body adapts metabolically after roughly two weeks and starts conserving the energy it's missing. That adaptation can reduce your expenditure by as much as 30%, which is why weight loss often stalls on a long, flat diet — and why weight tends to come back once you return to your previous eating habits.

To keep burning stored fat instead of settling into that energy-saving mode, try the following approach:

Phase 1: To get your body using stored fat as a backup fuel source, you first need to create a temporary shortage of glucose in your blood. Do that by cutting carbohydrates as close to zero as possible for a short stretch — usually 1–2 days (see the more extreme version below). In practice this phase looks like "protein and leafy greens": lean meat, soy-based protein, cottage cheese, low-fat cheese, and eggs for protein; spinach, lettuce, cabbage, kale, and similar vegetables on the side. Mediterranean- and Chinese-style salads work well here too, minus any starchy sides. You should end up mildly hypoglycemic during this phase — symptoms include headache, fatigue, irritability, usually (not always) hunger, and reduced physical and mental performance (be careful here if your job is demanding). Competitive athletes shouldn't go more than 3 days without carbs.

Phase 2: Once you've reached that mild hypoglycemic state, move into phase two: gradually increasing your carbohydrate intake again. Raising it step by step, roughly 20–25% more each day, keeps your body from settling into energy-saving mode. Within 3–6 days you'll be back to a normal carb intake — at which point it's no longer a reduction diet, so the next day you go back to phase one.

A more extreme version of this approach is 5 days of phase one followed by 2 days of phase two — five days of restriction, two days of normal eating. Five days is close to the outer limit for someone who isn't a competitive or regularly training athlete; beyond that you risk losing a meaningful amount of muscle, which can reduce athletic performance. Some people actually find this version easier psychologically, since sticking to phase one is often easier for them than reining themselves in during the gradual re-feed of phase two. Repeat the whole cycle for as long as it takes to reach your goal. Expect roughly 3–8 kg (7–18 lb) of loss per month.

A few things worth keeping in mind on a reduction diet:

1. Losing more than 1.5 kg (about 3 lb) a month tends to make the body "remember" that fat loss and try to restore it once the diet ends — keep an eye on your weight even after you stop dieting.
2. In women, dropping body fat below roughly 15% isn't physiologically normal. Going lower risks hormonal disruption and loss of a regular menstrual cycle.
3. In some people, excessive focus on leanness can contribute to disordered eating. The risk is higher if a close relative has a history of it.
4. Fit phase one and phase two around your work and personal schedule — whatever arrangement suits your week best.
5. Try to keep your protein intake fairly constant throughout. A sudden drop or skipping it altogether can speed up the number on the scale, but that comes from losing muscle, which hurts your overall look (which is presumably the actual goal) and can cause other issues like back pain or breathing difficulty.
6. Once you've hit your target and want to maintain a lighter version of the diet, you can shift to using phase one for just one day at a time, or cycle a full week of it followed by a week of normal eating.
7. Oily fish and plant oils support fat burning. Where possible, try to include a small serving — a salad dressed with oil, or a teaspoon of rapeseed (canola) oil for those who don't enjoy fish — every 2–3 hours throughout the diet (and beyond it too). Polyunsaturated fats, kept consistently present in the blood, block the body's own enzymes that would otherwise promote fat storage.
8. If your usual diet has been extremely poor for a long time, a sudden, complete overhaul might not sit well with you psychologically. Try cutting back on the most obviously unsuitable foods first — that alone tends to produce results — and gradually work toward better-quality eating from there. You may not even need a strict reduction phase in the end.
9. Physical activity strengthens the effect of the diet, but the key factor is sticking to the eating plan, not the exercise itself.
10. Skip drinks marketed specifically for weight loss — most are mainly a marketing product. If you want a meal-replacement drink, pick one with a high protein content and use it as your last meal of the day. Fish oil, lecithin, fiber tablets, and a moderate-dose fat-burning aid like garcinia cambogia (HCA) can all be useful supporting supplements. If you take a multivitamin only once a day, take it at night.

Restricting your food intake can also mean smaller stool volume and constipation. The best fix is extra vegetables (raw or in tablet form), powdered lecithin, fiber tablets, and increased water intake. Aim for at least 0.25–0.33 liters of fluid (water, soup, etc.) per 10 kg of bodyweight.

Pay more attention to your measurements than to the number on the scale. If you're improving your diet and staying active, it's normal for lean body mass to tick up slightly, so you may see the loss show up in your waist and hip measurements before you see it on the scale.

Keep a log of everything you eat and drink, and review it calmly in the evening when you have a quiet moment.