Breakfast

2 desertspoons porridge (50 cals & 9 carbs)
1 desertspoon wheat bran (13 cals & 1 carb)
2 desertspoons oat bran (50 cals & 8 carbs)
1 desertspooon of sultanas (46 cals & 11 carbs)
1 teaspoon honey (18 cals & 5 carbs)
Pura heart milk cholesterol lowering (80 cals & 8 carbs)
1 slice Burgen Honey and Oatbran cholesterol lowering toast (90 cals & 12 carbs)

Totals for breakfast - Calories 347 Carbs 54


Lunch

2 slices Burgen Honey and Oatbran cholesterol lowering toast (180 cals & 24 carbs)
10 grams Pro Active UltaLight Cholesterol lowering spread (21 cals)
100 grams of Tuna in springwater (84 cals & 1 carb)
1 medium apple (65 cals & 18 carbs)
11 grapes (37 cals & 9 carbs)
Flat white skinny coffee (11 cals)

Totals for lunch - Calories 398 Carbs 52


Dinner

100 grams boiled chicken thigh with all visible fat removed (127 cals)
10 grams Pro Active UltaLight Cholesterol lowering spread (21 cals)
100 grams sweet potato (65 cals & 17 carbs)
Steamed (in colander)
Broccoli
Celery
Mushrooms
Snow peas
Cabbage
Cauliflower
Carrot
Zuchini (total for vegetable around 200 cals and 14 carbs)

Totals for dinner - Calories 413 Carbs 31


Total Daily intake

Calories - 1158
Carbs - 137

I also have -

1 cup of black tea
2 cups of green tea
400 mls of water with 2 x teaspoons of Metamucil (dietary fibre Phsysllium seed)
+ water as needed
1 multivitamin tablet
1 vitamin C tablet


I'm a 6' male, 45 years old very over weight and would say sedentary. Is 1158 calories daily what I should be aiming for?
In 5 weeks I have lost 5" off my belt line, but am worried after doing some reading about that if I don't have enough cals I might be only losing muscle and not fat.

Please any suggestions or advice would be greatly appreciated.