Here’s an actual video from Lukaku himself, talking to a Belgian journalist about his weight in the year
2018.
So yeah, he’s literally on tape saying this stuff, no weird third hand sources, twitter journalists and ESPN or club website stats. Some paraphrased and translated ‘quotes’ from this video:
“I know that 102 [kg] is my maximum in terms of weight. I know that when I’m above 102 I have a problem, I feel bad.”
“But I know that when I go below 99 [kg] I’m too light. So I have to stay in between those limits.”
“Lukaku: When I was at Anderlecht my weight was 110 [at one point near the end]
Journo: so way too heavy?
Lukaku: Yeah but I had the same fat percentage so it was all muscle mass. Then I came there [at Chelsea] and they said ‘wow, 110 kg’. But my fat percentage was 9%. They said ‘this is impossible for 193 cm’.
Then Anelka came to me and told me, ‘eat what you want during the day until 4 in the afternoon, after that only water and no more eating’. Two or three weeks later my weight had dropped down.”
https://www.hln.be/showbizz/tv/romelu-lukaku-onthult-hoe-hij-zijn-gewicht-onder-controle-kreeg-de-kilo-s-vlogen-eraf~ad3b3601