Can you lose 5 pounds in a week?

Water vs fat

You can lose 5 pounds on the scale in a week, mostly from water, especially in your first week or if you start with a high weight. Losing 5 lb of fat in a week would take a deficit of about 2,500 calories a day, which isn't safe for most people.

Water loss is still real: you may feel less bloated and lighter. It's just not the same as fat loss, and some can come back when you eat more carbohydrate.

Think of week one as a bonus, and the steady weeks after it as where the lasting change happens.

Safe ways to drop water weight

• Lower salt: skip salty takeout, chips and processed meats for a week.
• Cut sugary drinks and alcohol: both add calories and can make you hold water.
• Ease off refined carbs: fewer pastries and white bread uses up some stored glycogen and its water.
• Drink enough water: it sounds odd, but good hydration helps your body let go of extra fluid. See your water target.
• Get fiber: vegetables and fruit help with regularity.

Small, sensible changes like these are enough.

A sample low-salt day

• Breakfast: oatmeal made with milk, topped with berries and a spoon of nut butter
• Lunch: homemade chicken and vegetable bowl with brown rice, using lemon and herbs instead of soy sauce
• Snack: plain Greek yogurt with a sliced peach
• Dinner: baked salmon, roasted sweet potato and green beans
• Drinks: water, sparkling water, coffee or tea

Cooking at home is the easiest way to cut salt, since packaged and restaurant foods supply most of the sodium in a typical US diet. The Dietary Guidelines suggest less than 2,300 mg of sodium a day for adults. Check labels on bread, soups and sauces, which can be surprisingly salty.

Plus real fat loss

Pair the water steps with a 500 to 1,000 calorie daily deficit from the deficit calculator, protein at every meal and a daily walk. A lightly active 250 lb man burns about 2,820 calories a day at 5 ft 10 in; eating around 1,900 could give him roughly 2 lb of fat loss plus water.

Over the week, that's a nice combination: a few pounds of water from cutting salt and refined carbs, plus 1 to 2 lb of fat. Expect part of the water to come back if you return to salty, carb-heavy meals. The fat stays gone as long as your habits stay steady. For protein, check your protein floor.

Shortcuts to skip

• Laxatives and "detox teas": they cause water and electrolyte loss, not fat loss. See laxatives and weight loss.
• Diuretic pills without a prescription: risky for your heart and kidneys.
• Eating under 1,200 (women) or 1,500 (men) calories without medical supervision.
• Saunas and sweat suits for weight: you lose sweat, then drink it back.

When a big drop needs a doctor

A fast drop from cutting salt and sugar is usually harmless. But call your doctor if a big weight change comes with any of these:

• Vomiting or diarrhea that lasts more than a day or two
• Dizziness when you stand, dark urine or very little urine
• A racing heartbeat or muscle cramps
• Weight loss you didn't plan

Also check with your doctor before cutting salt or carbs hard if you take water pills, blood pressure medicines, insulin or an SGLT2 inhibitor, since doses may need a change. For hydration basics, see water and weight loss.

What week two looks like

After a 5 lb first week, week two often shows 1 to 2 lb. That's not a stall; it's your real fat-loss pace showing up. Watch the trend in the weigh-in tracker and read how much you can lose in a week.

Stay with the same habits and let the trend do its work.

Who drops the most water weight

Week-one water loss tends to be larger if you:

• Start at a higher body weight
• Usually eat a lot of refined carbs or salty food
• Cut back on alcohol and sugary drinks at the same time
• Are near the end of a menstrual cycle when water retention eases

People who already eat lightly and cook at home usually see a smaller first-week drop, often 1 to 3 lb. That doesn't mean they're doing worse; their fat loss pace is the same. Track the weekly trend in the weigh-in tracker.