How Much Should You Eat to Lose Weight
Written by Ariana Hakman, Entrepreneur and COO
Ariana Hakman is a former corporate finance executive turned serial entrepreneur in fitness, nutrition, and tech. She’s the co-founder of LunaFit, a multi-brand wellness company anchored by its fast-growing LunaFit app, built to help users take control of their nutrition, workouts, and daily habits.
One of the most common questions in health and fitness is also one of the most misunderstood: “How many calories should I eat to lose weight?” You might expect a simple number: 1,200, 1,500, or some other one-size-fits-all answer. But here’s the truth: the right calorie intake is deeply personal, and eating too little might actually be the reason you’re not losing weight at all. Let’s break down why and what you should focus on instead.
The real math behind weight loss: TDEE explained
To understand how much you should be eating, we have to start with your TDEE, or Total Daily Energy Expenditure. This is the number of calories your body burns each day through:
Basic functions (like breathing and digestion)
Daily movement (mostly your step count)
Exercise and workouts (lift those weights!!!)
If you're eating below your TDEE, you're in a calorie deficit, which is how fat loss happens. But here’s the catch, too big of a deficit can backfire.
Your body isn't just a calculator. While “calories in, calories out” is good baseline advice, your body is also a smart, adaptive system. Cut calories too low for too long, and your metabolism can slow down, your energy levels crash, and your hunger hormones go haywire.
That’s why so many people hit a plateau—or feel miserable—on overly restrictive diets.
Why 1,200 calories isn’t the magic number
Unless you’re extremely petite, sedentary, or under medical supervision, 1,200 calories is most likely too low.
That number became popular thanks to old-school diet culture, but it doesn’t reflect the energy needs of most adults, especially those who are even moderately active.
And the ironic part? Eating too little can make fat loss harder. Sure, you may lose weight at first, but much of it might be muscle. And when your body senses starvation, it holds onto fat for protection.
It’s a vicious cycle: the more muscle you lose, the lower your metabolism drops. That means you burn fewer calories at rest, and weight loss becomes even harder.
So, how many calories should you eat?
This is where personalized tools come in. Instead of guessing, you need a calculation based on:
Your current weight and goal
Your daily activity level
Your age, gender, and body composition
Your metabolism (which adapts over time)
That’s exactly what we built into the LunaFit App, it includes a simple calorie and macro calculator that adjusts as your body and goals change. It takes the guesswork out of your plan so you can focus on what actually works.
Three quick fixes if you’re not seeing progress
1. Track what you're eating (honestly)
Most people underestimate intake by 300–500 calories per day. Think of sauces, the goldfish you grabbed from your toddler, or the grazing you do while packing lunches or cooking dinner, it all adds up!
2. Eat enough protein
Protein keeps you full, preserves muscle, and supports fat loss. And I hate to rain on your parade, but nuts are not a protein, they’re a fat that contains a little protein. So dump the trail mix and focus on things like lean meats, low-fat dairy, or eggs.
3. Stay consistent
You don’t need perfection, just a steady rhythm. Don’t sweat the cake at a birthday party or the glass of wine at dinner. Just don’t let it spiral into a week of "I'll start over Monday."
Final thoughts: Less isn’t always more
Weight loss isn’t about suffering, starving, or skipping meals. It’s about fueling your body properly, creating a sustainable (and realistic) deficit, and allowing your metabolism to work with you, not against you.
So if you're asking, “How much should I eat to lose weight?” The best answer is: Enough to support your health, your lifestyle, and your long-term goals.
And if you're ready to ditch the guesswork, the LunaFit App has everything you need to calculate your perfect intake, track your progress, and finally see results that last.
Read more from Ariana Hakman
Ariana Hakman, Entrepreneur and COO
Ariana Hakman is a leading voice in fitness, nutrition, and lifestyle innovation, known for creating practical tools that drive real results. After 13 years in corporate finance within the healthcare sector, she left the boardroom to build a more balanced life for her daughter, and a business that aligned with her values. She co-founded LunaFit, a wellness brand and mobile app helping users simplify their workouts, nutrition, and daily habits. Ariana has built four companies across wellness and tech, with a mission to make healthy living simple, sustainable, and achievable for all.
